Question

How to round a number up to the nearest 10 in C

Answer 1

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

int roundUpToNearest10(double num) {
    return (int)ceil(num / 10) * 10;
}

int main(void) {
    printf("%d\n", roundUpToNearest10(33));
    printf("%d\n", roundUpToNearest10(59));
    printf("%d\n", roundUpToNearest10(599.99));
    printf("%d\n", roundUpToNearest10(3.14));
    printf("%d\n", roundUpToNearest10(2));
    printf("%d\n", roundUpToNearest10(19));
    printf("%d\n", roundUpToNearest10(-12));
    printf("%d\n", roundUpToNearest10(-101));
    printf("%d\n", roundUpToNearest10(-109));

    return 0;
}



/*
run:

40
60
600
10
10
20
-10
-100
-100

*/

 

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