Program to Convert Octal Number to Binary Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Octal_to_Binary(long n)
{
        long binary_num = 0, decimal_num = 0, i = 0;
        while(n!=0)
        {
                decimal_num = decimal_num + ((n%10) * pow(8,i));
                ++i;
                n = n/10;
        }
        i = 1;
        while(decimal_num!=0)
        {
                binary_num = binary_num + ((decimal_num % 2) * i);
                decimal_num = decimal_num/2;
                i = i*10;
        }
        return binary_num;
}
int main()
{
        long num;
        cout<<"Enter a octal number : ";
        cin>>num;
        cout<<"Octal Number "<<num<<" is equal to "<<Octal_to_Binary(num)<<" Binary Number."<<endl;
        getch();
        return 0;
}


Output

Program to Convert Binary Number to Octal Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Binary_to_Octal(long n)
{
        long octal_num = 0, decimal_num = 0, i = 0;
        while(n!=0)
        {
                decimal_num = decimal_num + ((n%10) * pow(2,i));
                ++i;
                n = n/10;
        }
        i = 1;
        while(decimal_num!=0)
        {
                octal_num = octal_num + ((decimal_num % 8) * i);
                decimal_num = decimal_num/8;
                i = i*10;
        }
        return octal_num;
}
int main()
{
        long num;
        cout<<"Enter a binary number : ";
        cin>>num;
        cout<<"Binary Number "<<num<<" is equal to "<<Binary_to_Octal(num)<<" Octal Number."<<endl;
        getch();
        return 0;
}


Output

Program to Convert Decimal Number to Octal Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Decimal_to_Octal(long n)
{
        int octal_number = 0, i = 1, remainder;
        while(n!=0)
        {
                remainder = n%8;
                n = n/10;
                octal_number = octal_number + (remainder*i);
                i = i*10;
        }
        return octal_number;
}
int main()
{
        long num;
        cout<<"Enter a decimal number : ";
        cin>>num;
        cout<<"Decimal Number "<<num<<" is equal to "<<Decimal_to_Octal(num)<<" Octal Number."<<endl;
        getch();
        return 0;
}


Output

Convert Octal Number to Decimal Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Octal_to_Decimal(long n)
{
        int decimal_number = 0, i = 0, remainder;
        while(n!=0)
        {
                remainder = n%10;
                n = n/10;
                decimal_number = decimal_number + (remainder*pow(8,i));
                ++i;
        }
        return decimal_number;
}
int main()
{
        long num;
        cout<<"Enter an octal number : ";
        cin>>num;
        cout<<"Octal Number "<<num<<" is equal to "<<Octal_to_Decimal(num)<<" Decimal Number."<<endl;
        getch();
        return 0;
}


Output

Program to Convert Decimal Number to Binary Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Decimal_to_Binary(long n)
{
        long binary_number = 0;
        int remainder = 0, i = 1, step = 1;
        while(n!=0)
        {
                remainder = n%2;
                cout<<"Step : "<<step++<<"\t"<<n<<"/2\tRemainder = "<<remainder<<"\tQuotient = "<<n/2<<endl;
                n = n/2;
                binary_number = binary_number + (remainder*i);
                i = i*10;
        }
        return binary_number;
}
int main()
{
        int num;
        cout<<"Enter a decimal number : ";
        cin>>num;
        cout<<"Decimal Number "<<num<<" is equal to "<<Decimal_to_Binary(num)<<" Binary Number."<<endl;
        getch();
        return 0;
}


Output

Program Convert Binary Number to Decimal Number in c++

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
int Binary_to_Decimal(long n)
{
        int decimal_number=0, i=0, remainder;
        while(n!=0)
        {
                remainder = n%10;
                n = n/10;
                decimal_number = decimal_number + (remainder*pow(2,i));
                ++i;
        }
}
int main()
{
        long num;
        cout<<"Enter a binary number : ";
        cin>>num;
        cout<<"Binary Number "<<num<<" is equal to "<<Binary_to_Decimal(num)<<" Decimal Number."<<endl;
        getch();
        return 0;
}


Output

Program to find Quotient and Remainder in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int divisor, dividend, quotient, remainder;
        cout<<"Enter dividend : ";
        cin>>dividend;
        cout<<"Enter Divisor : ";
        cin>>divisor;
        quotient = dividend / divisor;
        remainder = dividend % divisor;
        cout<<"Quotient : "<<quotient<<endl;
        cout<<"Remainder : "<<remainder<<endl;
        getch();
        return 0;
}


Output

How to find Leap Year in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int year;
        cout<<"Enter the year : ";
        cin>>year;
        if(year%4==0)
        cout<<year<<" is a leap year.";
        else
        cout<<year<<" is not a leap year.";
        getch();
        return 0;
}

Output

Greater in three numbers in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int var1, var2, var3;
        cout<<"Enter three numbers\n";
        cin>>var1>>var2>>var3;
        if(var1>var2 && var1>var3)
        cout<<var1<<" is greater in three numbers."<<endl;
        else if(var2>var3)
        cout<<var2<<" is greater in three numbers."<<endl;
        else
        cout<<var3<<" is greater in three numbers."<<endl;
        getch();
        return 0;
}

Output

Area of triangle in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int base, height;
        float area;
        cout<<"Enter base and height\n";
        cin>>base>>height;
        area=0.5*base*height;
        cout<<"Area of triangle : "<<area;
        getch();
        return 0;
}

Output

Area of rectangle in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        float lenght, breath;
        double area;
        cout<<"Enter length and breath\n";
        cin>>lenght>>breath;
        area=lenght*breath;
        cout<<"Area of rectangle : "<<area;
        getch();
        return 0;
}

Output

Area of circle in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        float radius;
        double area;
        cout<<"Enter radius of circle : ";
        cin>>radius;
        area=3.14*radius*radius;
        cout<<"Area of circle : "<<area;
        getch();
        return 0;
}

Output

Average of five marks in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int a,b,c,d,e;
        float avg;
        cout<<"Enter marks of five marks\n";
        cin>>a>>b>>c>>d>>e;
        avg=(a+b+c+d+e)/5;
        cout<<"Average Marks : "<<avg;
        getch();
        return 0;
}

Output

Compound Interest in c++

#include<iostream>
#include<math.h>
#include<conio.h>
using namespace std;
int main()
{
        double p, t, r, A, CI;
        cout<<"Enter Principal Amount, Time and Rate\n";
        cin>>p>>t>>r;
        A=p*pow((1+(r/100)),t);
        CI=A-p;
        cout<<"Compound Interest : "<<CI;
        getch();
        return 0;
}

Output

Simple Interest in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        double p,t,r,SI;
        cout<<"Enter Inverted Amount, Time and Interest Rate\n";
        cin>>p>>t>>r;
        SI=(p*t*r)/100;
        cout<<"Simple Interest : "<<SI;;
        getch();
        return 0;
}

Output

Sum of two numbers in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int var1, var2;
        cout<<"Enter two numbers for sum\n";
        cin>>var1>>var2;
        cout<<"Sum of "<<var1<<" and "<<var2<<" is "<<var1+var2;
        getch();
        return 0;
}

Output

Python Reverse String

input_string=input("Enter a string : ")
output_string=input_string[::-1]
print("Reverse of string ",input_string," is ",output_string)

Output

Factorial in Python

num=int(input("Enter an integer to find factorial : "))
fact=1
if num<0:
        print("Factorial of negative numbers does not exist.")
elif num==0:
        print("Factorial of 0 is 1.")
elif num==1:
        print("Factorial of 1 is 1.")
else:
        for i in range(1,num+1):
                fact=fact*i
        print("Factorial of ",num," is ",fact)

Output

Factorial using recursion in c++

#include<iostream>
#include<conio.h>
using namespace std;
int fact_recurse(int n)
{
        if(n==1)
        return n;
        else
        return n*fact_recurse(n-1);
}
int main()
{
        int num;
        cout<<"Enter an integer to find factorial : ";
        cin>>num;
        if(num<0)
        cout<<"Factorial of negative numbers does not exist.";
        else if(num==0)         cout<<"factorial of 0 is 1.";
        else
        cout<<"Factorial of "<<num<<" is "<<fact_recurse(num);
        getch();
        return 0;
}

Output

Factorial using Recursion in python

def fact_recurse(n):
        if n==1:
                return n
        else:
                return n*fact_recurse(n-1)
num=int(input("Enter an integer to find factorial : "))
if num<0:
        print("Factorial of negative numbers does not exist.")
elif num==0:
        print("Factorial of 0 is 1.")
else:
        print("Factorial of ",num," is ",fact_recurse(num))

Output

Series of prime numbers in python

num=int(input("Enter a number till which you want to print prime numbers : "))
for x in range(1,num) :
         if x>1 :
                for y in range(2,x) :
                        if (x%y) ==0 :
                                break
                else:
                        print(x)

Output

Prime Number in Python

num=int(input("Enter an integer : "))
if num>1 :
        for i in range(2,num):
                if(num%i)==0:
                        print(num," is a prime number")
                        break
        else:
                print(num," is a prime number")
else:
        print(num," is a prime number")

Output

Factorial in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int num, fact=1;
        cout<<"Enter a number to find factorial : ";
        cin>>num;
        for(int i=1;i<=num;i++)
        {                 fact=fact*i;
        }
        cout<<"Factorial of "<<num<<" is "<<fact;
        getch();
        return 0;
}

Output

Palindrome in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int n, num, reverse=0;
        cout<<"Enter a number : ";
        cin>>n;
        num=n;
        while(num!=0)
        {
                reverse=(num%10)+(reverse*10);
                num=num/10;
        }
        if(n==reverse)
        cout<<n<<" is a Palindrome Number.";
        else
        cout<<n<<" is not a Palindrome Number.";
        getch();
        return 0;
}

Output

Even or Odd in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int num;
        cout<<"Enter number to check even or odd : ";
        cin>>num;
        if(num%2==0)
        cout<<num<<" is an even number.";
        else
        cout<<num<<" is an odd number.";
        getch();
        return 0;
}

Output

Swapping of numbers in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int num1, num2, temp;
        cout<<"Enter two numbers for swapping\n";
        cin>>num1>>num2;
        cout<<"Numbers before swapping\n";
        cout<<"Num1 = "<<num1<<"\tNum1 = "<<num2;
        temp=num1;
        num1=num2;
        num2=temp;
        cout<<"\nNumbers sfter swapping\n";
        cout<<"Num1 = "<<num1<<"\tNum2 = "<<num2;
        getch();
        return 0;
}

Output

Binary Search in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int n,num,first=0,middle,last;
        cout<<"Enter the size of your array : ";
        cin>>n;
        int *arr=new int[n];
        cout<<"Enter element of array\n";
        for(int i=0;i<n;i++)
        {
                cin>>arr[i];
        }
        cout<<"\nElement of array\n";
        for(int i=0;i<n;i++)
        {
                cout<<arr[i]<<"\t";
        }
        cout<<"\nEnter number to search : ";
        cin>>num;
        last=n-1;
        middle=(first+last)/2;
        while(first<=last)
        {
                if(arr[middle]<num)
                {
                        first=middle+1;
                }
                else if(arr[middle]==num)
                {
                        cout<<num<<" is found at "<<middle+1<<" possition";
                        break;
                }
                else
                {
                        last=middle-1;
                }
                middle=(first+last)/2;
        }
        if(first>last)
        {
                cout<<num<<" is not found in the array list.";
        }
        getch();
        return 0;
}

Output

Linear Search in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
        int n,num,flag=0,pos;
        cout<<"Enter the size of array : ";
        cin>>n;
        int *arr=new int[n];
        cout<<"Enter elements of array\n";
        for(int i=0;i<n;i++)
        {
                cin>>arr[i];
        }
        cout<<"Elements of array\n";
        for(int i=0;i<n;i++)
        {
                cout<<arr[i]<<"\t";
        }
        cout<<"\nEnter element to search : ";
        cin>>num;
        for(int i=0;i<n;i++)
        {
                if(arr[i]==num)
                {
                        flag=1;
                        pos=i+1;
                        break;
                }
        }
        if(flag==1)
        {
                cout<<num<<" is found at "<<pos<<" possition.";
        }
        else
        {
                cout<<num<<" is not found in the array list.";
        }
        getch();
        return 0;
}

Output

Sorting of Array in Ascending Order in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
          int i,j,n,temp;
          cout<<"Enter size of array : ";
          cin>>n;
          int *arr=new int[n];
          cout<<"Enter elements of array\n";
          for(i=0;i<n;i++)
          {
                    cin>>arr[i];
          }
          cout<<"Elements of array\n";
          for(i=0;i<n;i++)
          {
                    cout<<arr[i]<<"\t";
          }
          cout<<"\nSorted elements of array\n";
          for(i=0;i<n;i++)
          {
                    for(j=0;j<n-i-1;j++)
                    {
                              if(arr[j]>arr[j+1])
                              {
                                        temp=arr[j];
                                        arr[j]=arr[j+1];
                                        arr[j+1]=temp;
                              }
                    }
          }
          for(i=0;i<n;i++)
          {
                    cout<<arr[i]<<"\t";
          }
          getch();
          return 0;
}

Sorting of Array in c++

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
          int i,j,n,temp;
          cout<<"Enter size of array : ";
          cin>>n;
          int *arr=new int[n];
          cout<<"Enter elements of array\n";
          for(i=0;i<n;i++)
          {
                    cin>>arr[i];
          }
          cout<<"Elements of array\n";
          for(i=0;i<n;i++)
          {
                    cout<<arr[i]<<"\t";
          }
          cout<<"\nSorted elements of array\n";
          for(i=0;i<n;i++)
          {
                    for(j=0;j<n-i-1;j++)
                    {
                              if(arr[j]<arr[j+1])
                              {
                                        temp=arr[j];
                                        arr[j]=arr[j+1];
                                        arr[j+1]=temp;
                              }
                    }
          }
          for(i=0;i<n;i++)
          {
                    cout<<arr[i]<<"\t";
          }
          getch();
          return 0;
}

Omitting any line which starts from #,*,@,&, etc

f1=open("OldFile.txt","r")        //Opening old file from which we will fetch the data

f2=open("NewFile.txt","w")     //Opening new file to store the remaining data of old file

while True:
          text=f1.readline()            //fetching data to a variable from old file
          if text[0]=="#":                //here you can change the comparing condition #,*,@,&
                    continue
          f2.write(text)
f2.close()
f1.close()

f1=open("NewFile.txt","r")
print(f1.read())
f1.close()

Copying content of one file to another file

f1=open("OldFile.txt","w")                //Opening of old file in write mode for writing the data
f1.write("This is old file")                  //Writing to the file
f1.close()                                            //Closing of old file

f1=open("OldFile.txt","r")                //Opening new file in read mode 
text=f1.read()                                    //Reading from file and storing data into another variable
f1.close()                                           //Closing of old file

f2=open("NewFile.txt","w")             //Opening new file in write mode for copying the data
f2.write(text)                                     //Writing data means copying the of old file to new file
f2.close()                                           //Closing of new file

f2=open("Newfile.txt","r")               //Opening new file in read mode  
print(f2.read())                                  //Reading copied data from new file
f2.close()                                           //Closing new file

Take user input data

print("Writing into file.....")

f1=open("file.txt","w")             //Opening a file in write  (existing or non-existing)

f1.read(input())                       //Taking user input to write into file

f1.close()                                //Closing file 

f1=open("file.txt","r")               //Opening file to read data

print(f1.read())                        //Reading data from file

f1.close()                               //Closing file

Creating, Reading and Writing into File

print("Writing into file.....")

f1=open("File.txt","w")     //Opening and creating file into write mode

f1.write(input())                 //Writing into file

f1.close()

print("Reading from file.....")

f1=open("File.txt","r")               //Opening file in read mode

a=f1.read()                                 //Reading from file

print(a)

f1.close()

How to print half upper diamond in c++?

#include<iostream>

#include<conio.h>

using namespace std;

int main()

{

          int k,c,num,space=1;

          cout<<"How many rows do you want ? ";

          cin>>num;

          space=num-1;

          for(k=1;k<=num;k++)

          {

                    for(c=1;c<=space;c++)

                    {

                              cout<<" ";

                    }

                    space--;

                    for(c=1;c<=space;c++)

                    {

                              cout<<"*";

                    }

                    cout<<endl;

          }

          getch();

          return 0;

}

          

How to print '*' in increasing order in c++?

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
           int num;
           cout<<"Enter how many rows do you want ? ";
           cin>>num;
for(int i=0;i<num;i++)
           {
for(int j=0;j<=i;j++)
                     {
cout<<"*";
}
cout<<endl;
}
getch();
return 0;
}

Output

How to print '*' in decreasing order in c++??

#include<iostream>
#include<conio.h>
using namespace std;
int main(){
int choice;
cout<<"Enter how many rows do you want ? ";
           cin>>choice;
for(int i=choice-1;i>=0;i--)
           {
for(int j=0;j<=i;j++) 
                    {
cout<<"*";
}
cout<<endl;
}
getch();
return 0;
}

Output

How to print half lower diamond in c++?

#include<iostream>

#include<conio.h>

using namespace std;

int main()

{

int num;

cout<<"Enter a number : "; cin>>num;

for(int i=0;i<num;i++)

{

for(int j=0;j<=i;j++)

{

cout<<" ";

}

for(int k=0;k<2*(num-i)-1;k++)

{

cout<<"*";

}

cout<<endl;

}

getch();

return 0;

}

Output

How to print diamond shape in c++?

#include<iostream>
#include<conio.h>
using namespace std;
int main(){
int k,c,num,space=1;
cout<<"How many rows do you want ? ";
cin>>num;
space=num-1;
for (k = 1; k <= num; k++)
  {
    for (c = 1; c <=space; c++)
    {
    cout<<" ";
}
      space--;
    for (c = 1; c <= 2*k-1; c++)
    {
    cout<<"*";
}
    cout<<endl;
  }
  space=1;
for(k=1;k<=num-1;k++)
{
for(c=1;c<=space;c++)
{
cout<<" ";
}
space++;
for(c=1;c<=2*(num-k)-1;c++)
{
cout<<"*";
}
cout<<endl;
}
getch();
return 0;
}

Output