[Solved] Why this code not giving desired output?

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Try the fix below.

Note the 40.0 and 20.0 instead of 40 and 20. The issue is that you were doing integer division. 40 / 100 == 0, so da was always 0. Using 40.0 / 100 instead gives you floating point division and the value 0.4, which is what you want to make your calculations correct. (The same holds for the computation of hra.)

#include <stdio.h>

int main() {
    float da, hra, s, gs;

    scanf("%f", &s);

    da = 40.0 / 100 * s;
    hra = 20.0 / 100 * s;
    gs = s + da + hra;

    printf("%f", gs);

    return 0;
}

solved Why this code not giving desired output?