C Program to Insert Element into Array

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
int arr[100], size=0;
void insert_beg();
void insert_pos();
void insert_last();
void display();
int main(){
        int choice;
        printf("Enter size of the array : ");
        scanf("%d",&size);
        printf("Enter the array elements one by one.....\n");
        for(int i=0;i<size;i++){
                scanf("%d",&arr[i]);
        }
        while(1){
                printf("\n\t\t1. Insert at beginning\n\t\t2. Insert at given possition\n\t\t3. Insert at last\n\t\t4. Display array elements\n\t\t5. Exit\n");
                scanf("%d",&choice);
                switch(choice){
                        case 1:
                                insert_beg();
                                break;
                        case 2:
                                insert_pos();
                                break;
                        case 3:
                                insert_last();
                                break;
                        case 4:
                                display();
                                break;
                        case 5:
                                exit(0);
                        default:
                                printf("Invalid Choice.....Please try again.....\n");
                }
        }
        getch();
}
void insert_beg(){
        int item;
        printf("Enter element to insert : ");
        scanf("%d",&item);
        for(int i=size;i>0;i--){
                arr[i]=arr[i-1];
        }
        arr[0]=item;
        size++;
        printf("The entered item %d is inserted at beginnng.\n",item);
        for(int i=0;i<size;i++){
                printf("%d\t",arr[i]);
        }
}
void insert_pos(){
        int item, pos;
        printf("Enter item to insert : ");
        scanf("%d",&item);
        printf("Enter possition at which you want to insert : ");
        scanf("%d",&pos);
        for(int i=size;i>=pos;i--){
                arr[i]=arr[i-1];
        }
        arr[pos-1]=item;
        size++;
        printf("The entered element %d is inserted at %d possition.\n",item,pos);
        for(int i=0;i<size;i++){
                printf("%d\t",arr[i]);
        }
}
void insert_last(){
        int item;
        printf("Enter element to insert at last : ");
        scanf("%d",&item);
        for(int i=size;i>=size+1;i--){
                arr[i]=arr[i-1];
        }
        arr[size]=item;
        size++;
        printf("The entered item %d is inserted at last.\n",item);
        for(int i=0;i<size;i++){
                printf("%d\t",arr[i]);
        }
        printf("\n");
}
void display(){
        printf("The array elements.....\n");
        for(int i=0;i<size;i++){
                printf("%d\t",arr[i]);
        }
        printf("\n");
}

Output