C庫函數(shù)double exp(double x) 返回值e的第x次方。
以下是exp() 函數(shù)的聲明。
double exp(double x)
x -- 這是浮點值。
這個函數(shù)返回x的指數(shù)值。
下面的例子顯示 exp() 函數(shù)的用法。
#include <stdio.h> #include <math.h> int main () { double x = 0; printf("The exponential value of %lf is %lf ", x, exp(x)); printf("The exponential value of %lf is %lf ", x+1, exp(x+1)); printf("The exponential value of %lf is %lf ", x+2, exp(x+2)); return(0); }
讓我們編譯和運行上面的程序,這將產(chǎn)生以下結(jié)果:
The exponential value of 0.000000 is 1.000000 The exponential value of 1.000000 is 2.718282 The exponential value of 2.000000 is 7.389056