C++ floor函数 截断符点数小数部分

函数原型：

double floor ( double x );

float floor ( float x );

long double floor ( long double x );

功能：返回一个小于传入参数的最大整数

参数：x为将来被处理的数

返回值：返回不大于x的最大整数

示例程序：

#include <stdio.h>#include <math.h>int main (){    printf ("floor of 2.3 is %.1lf/n", floor (2.3) );    printf ("floor of 2.6 is %.1lf/n", floor (2.6) );    printf ("floor of -2.3 is %.1lf/n", floor (-2.3) );    printf ("floor of -2.6 is %.1lf/n", floor (-2.6) );    return 0;}

输出：

floor of 2.3 is 2.0floor of 2.6 is 2.0floor of -2.3 is -3.0floor of -2.6 is -3.0