Question

How to round a number up in C

Answer 1

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

int main(void) {
    float f1 = 2.1f, f2 = 2.5f, f3 = 2.6f, f4 = 2.9f;

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

    float f5 = -2.1f, f6 = -2.5f, f7 = -2.6f, f8 = -2.9f;

    printf("%.1f\n", ceil(f5));
    printf("%.1f\n", ceil(f6));
    printf("%.1f\n", ceil(f7));
    printf("%.1f\n", ceil(f8));

    return 0;
}



/*
run:

3.0
3.0
3.0
3.0
-2.0
-2.0
-2.0
-2.0

*/

 

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