Sunny Number

Sunny Number is a number whose succeeding number is a perfect square.

Example 1: 15. Succeeding number is 16. 16 = 42 is a perfect square. Hence it is a Sunny Number.

Example 2: 18. Succeeding number is 19. Here as 19 is not a perfect square it is not a Sunny Number.

C
#include <stdio.h>
#include <math.h>
int main() 
{
    int n=0,m=0,root=0;
    printf("Enter a number: ");
    scanf("%d",&n);
    m=n+1;
    root=(int)sqrt(m);
    if((root*root)==m)
    {
        printf("%d is a Sunny Number",n);
    }
    else
    {
        printf("%d is not a Sunny Number",n);
    }
    return 0;
}
C