Every Pair exchange

#include <stdio.h>
int main()
{
    int a[100],n,i;
    int temp;

    printf("Enter total number of even elements: ");
    scanf("%d",&n);

    for(i=0;i < n;i++)
    {
        scanf("%d",&a[i]);
    }
    for(i=0;i<n;i+=2)
    {
        temp=a[i];
        a[i]=a[i+1];
        a[i+1]=temp;
    }

    printf("Every Pair exchange \n");
    for(i=0;i<n;i++)
    {
        printf("%d\n",a[i]);
    }
    return 0;
}