Calculation issue with decimal places in C

Question

I was trying to code a grayscale and have issues with the calculation. Can anyone explain why this returns 27.00000 instead of 27.66667?

#include <math.h>
#include <stdio.h>

int main(void)
{

    float count = ((27 + 28 + 28) / 3);
    printf("%f\n", count);

}

Answer 1

You forgot casting:

int main()
{
    float count = ((27 + 28 + 28) / (float)3);
    printf("%f\n", count);

    return 0;
}

Or:

int main()
{
    float count = ((27 + 28 + 28) / 3.0);
    printf("%f\n", count);

    return 0;
}

https://www.tutorialspoint.com/cprogramming/c_type_casting.htm