C语言中有没有FLOOR函数

C语言中有没有FLOOR函数

c语言标准库中有名为floor的函数。
函数的声明
double floor(double x)
参数： x-- 这是浮点类型的值
返回值： 返回小于或等于x的最大整数值
使用floor函数需要额外包含#include 头文件
示例
#include
#include
int main ()
{

float val1, val2, val3, val4;

val1 = 1.6;

val2 = 1.2;

val3 = 2.8;

val4 = 2.3;

printf("Value1 = %.1lf\n", floor(val1));

printf("Value2 = %.1lf\n", floor(val2));

printf("Value3 = %.1lf\n", floor(val3));

printf("Value4 = %.1lf\n", floor(val4));

return(0);
}
运行将产生以下结果：
Value1 = 1.0
Value2 = 1.0
Value3 = 2.0
Value4 = 2.0

有啊！浮点型

#include
#include

void main( void )
{
double y;

y = floor( 2.8 );
printf( "The floor of 2.8 is %f\n", y );
y = floor( -2.8 );
printf( "The floor of -2.8 is %f\n", y );

y = ceil( 2.8 );
printf( "The ceil of 2.8 is %f\n", y );
y = ceil( -2.8 );
printf( "The ceil of -2.8 is %f\n", y );
}

Output

The floor of 2.8 is 2.000000
The floor of -2.8 is -3.000000
The ceil of 2.8 is 3.000000
The ceil of -2.8 is -2.000000