c語(yǔ)言浮點(diǎn)函數(shù)庫(kù) c語(yǔ)言 浮點(diǎn)運(yùn)算
c語(yǔ)言fabs如何使用
fabs是求浮點(diǎn)數(shù)的絕對(duì)值的庫(kù)函數(shù)。它有穗亮一個(gè)double型形參，返回一個(gè)double型數(shù)據(jù)。當(dāng)不關(guān)心浮點(diǎn)數(shù)的符號(hào)只關(guān)心其數(shù)字部分時(shí)用fabs取得其絕培陵對(duì)值配族戚。舉例代碼如下：
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//#include?"stdafx.h"http://If?the?vc++6.0,?with?this?line.
#include?"stdio.h"
#include?"math.h"
int?main(void){
double?x=3.1415926,y=-x;
printf("x?=?%f\tfabs(x)?=?%f\n",x,fabs(x));
printf("y?=?%f\tfabs(y)?=?%f\n",y,fabs(y));
return?0;
}
輸出是：
c語(yǔ)言標(biāo)準(zhǔn)函數(shù)庫(kù)的float.h
FLT_RADIX
radix of floating-point representations
FLT_ROUNDS
floating-point rounding mode
Where the prefix FLT pertains to type float, DBL to type double, and LDBL to type long double:
FLT_DIG
DBL_DIG
LDBL_DIG
precision (in decimal digits)
FLT_EPSILON
DBL_EPSILON
LDBL_EPSILON
smallest number x such that 1.0 + x != 1.0
FLT_MANT_DIG
DBL_MANT_DIG
LDBL_MANT_DIG
number of digits, base FLT_RADIX, in mantissa
FLT_MAX
DBL_MAX
LDBL_MAX
maximum number
FLT_MAX_EXP
DBL_MAX_EXP
LDBL_MAX_EXP
largest positive integer exponent to which FLT_RADIX can be raised and remain representable
FLT_MIN
DBL_MIN
LDBL_MIN
minimum normalised number
FLT_MIN_EXP
DBL_MIN_EXP
LDBL_MIN_EXP
smallest negative integer exponent to which FLT_RADIX can be raised and remain representable
C語(yǔ)言函數(shù)庫(kù) 里有沒(méi)有 把字符串轉(zhuǎn)化為浮點(diǎn)數(shù) 的函數(shù)啊?
可以螞檔含采用庫(kù)函數(shù)atof, 頭文件為#include stdlib.h
函數(shù)名： atof
功 能：悶笑 把字符串蠢悶轉(zhuǎn)換成浮點(diǎn)數(shù)
用 法： double atof(const char *nptr);
實(shí)例：
#includestdlib.h
#includestdio.h
intmain()
{
double d;
char*str="12345.67";
d=atof(str);
printf("string=%sdouble=%lf\n",str,d);
return 0;
}
本文名稱：c語(yǔ)言浮點(diǎn)函數(shù)庫(kù) c語(yǔ)言 浮點(diǎn)運(yùn)算
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