Question

How to use ceil in C

Answer 1

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

int main(void) {
    float f1 = 1.1f, f2 = 1.5f, f3 = 1.6f, f4 = 1.9f, f5 = 0.01f;

    printf("%.1f\n", ceil(f1));
    printf("%.1f\n", ceil(f2));
    printf("%.1f\n", ceil(f3));
    printf("%.1f\n", ceil(f4));
    printf("%.1f\n", ceil(f5));

    return 0;
}



/*
run:

2.0
2.0
2.0
2.0
1.0

*/

 

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Answer 2

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

int main(void) {
    float f1 = -1.1f, f2 = -1.5f, f3 = -1.6f, f4 = -1.9f, f5 = -0.01f;

    printf("%.1f\n", ceil(f1));
    printf("%.1f\n", ceil(f2));
    printf("%.1f\n", ceil(f3));
    printf("%.1f\n", ceil(f4));
    printf("%.1f\n", ceil(f5));

    return 0;
}



/*
run:

-1.0
-1.0
-1.0
-1.0
-0.0

*/

 

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