Question

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

Answer 1

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

int roundDownToNearest10(double num) {
    return (int)floor(num / 10) * 10;
}

int main(void) {
    printf("%d\n", roundDownToNearest10(33));
    printf("%d\n", roundDownToNearest10(59));
    printf("%d\n", roundDownToNearest10(599.99));
    printf("%d\n", roundDownToNearest10(3.14));
    printf("%d\n", roundDownToNearest10(2));
    printf("%d\n", roundDownToNearest10(19));
    printf("%d\n", roundDownToNearest10(-12));
    printf("%d\n", roundDownToNearest10(-101));
    printf("%d\n", roundDownToNearest10(-109));

    return 0;
}



/*
run:

30
50
590
0
0
10
-20
-110
-110

*/

 

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