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Round down value how to use floor

#include <stdio.h> #include <math.h> int main () { printf ("floor of 3.3 is %.1lf\n", floor ( 3.3 ) ); printf ("floor of 4.8 is %.1lf\n", floor ( 4.8 ) ); printf ("floor of -2.3 is %.1lf\n", floor ( -2.3 ) ); printf ("floor of -3.8 is %.1lf\n", floor ( -3.8 ) ); return 0; }