DS LAB1 - Array

#include<stdio.h>
int main()
{
    int n,i,j, max,x=0,ch,temp,min,pos,p,v, temp1, temp2;
    printf("Enter array size: ");
    scanf("%d", &n);
    int a[n];
    for(i=0;i<n;i++){
        printf("Enter Element[%d]: ", x);
        scanf("%d", &a[i]);
        x++;
    }
    while(1){
        printf("\nPress 1 for Largest\n");
        printf("Press 2 for Sorting\n");
        printf("Press 3 for Insert\n");
        printf("Press 4 for Delete\n");
        printf("Press 5 for Exit\n");
        scanf("%d", &ch);
        if(ch==1){
            max=a[0];
            for(i=1;i<n;i++)
            {
                if(a[i]>max)
                    max=a[i];
            }
            printf("The largest number is: %d", max);
        }
        else if(ch==2){
                min=j;
            for(j=0;j<n-1;j++)
            {
                for(i=j+1;i<n;i++)
                {
                    if(a[j]>a[i])
                    {
                        temp=a[j];
                        a[j]=a[i];
                        a[i]=temp;
                    }
                }
            }
            for(i=0;i<n;i++)
                printf("%d ", a[i]);
        }

        else if(ch==3){
            printf("Enter Position: ");
            scanf("%d", &p);
            printf("Enter Value: ");
            scanf("%d", &v);
            if(p<0 || p>n)
                printf("Invalid\n");
            else
            {
                for(i=0; i<p; i++)
                {
                    temp1=a[i];
                    temp2=a[i+1];
                }
                a[p-1]=v;
                for(i=p-1; i<n; i++)
                {
                    a[i+1]=temp1;
                    temp1=temp2;
                    temp2=a[i+2];
                }
                n++;
            }
            for(i=0;i<n;i++)
                printf("%d ", a[i]);
        }

        else if(ch==4)
        {
            printf("Enter the position: ");
            scanf("%d", &pos);
            for(i=pos-1;i<n-1;i++)
                a[i]=a[i+1];
                n--;
            for(i=0;i<n;i++)
                printf("%d ", a[i]);
        }
        else if(ch==5)
        {
                printf("Thank You.\n");
                break;
        }
        else
            printf("Invalid Option\n");
    }
    return 0;
}