Write a C program to find the sum of the first 15 even numbers and calculate the square of the sum

void main()
{
     int c=1,i;
     unsigned int s=0;
     for(i=1;i<=15;i++)
     {
        if(i%2==0)
        {
            s=s+i;
            c=c+i;
        }
     }
     printf("Sum of the first 15 even numbers is: %d",s);
     printf("Square of the sum is: %d",(s*s));
}