W3School TIY Editor

#include <stdio.h> #include <math.h> int main() { printf("%f\n", floor(0.60)); printf("%f\n", floor(0.40)); printf("%f\n", floor(5)); printf("%f\n", floor(5.1)); printf("%f\n", floor(-5.1)); printf("%f\n", floor(-5.9)); return 0; }