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Floor

//Declaration: float floorf(float num);                 double floor(double num);                 long double floorl(long double num);   //Return:      Given 1.02, floor() would return 1.0.                Given -1.02, floor() would return -2.0.           #include <math.h>   #include <stdio.h>   int main(void)   {     printf("%f", floor(10.9));     }           /* 10.000000*/