exp()函数C ++
C/C++库函数doubleexp（doublex）将e的值提高到x的幂。以下是exp()函数的声明。
double exp(double x)
该参数是浮点值。并且此函数返回x的指数值。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main () {
double x = 0;
cout << "The exponential value of " << x << " is " << exp(x) << endl;
cout << "The exponential value of " << x+1 << " is " << exp(x+1) <<
endl;
cout << "The exponential value of " << x+2 << " is " << exp(x+2) <<
endl;
return(0);
}输出结果
The exponential value of 0 is 1 The exponential value of 1 is 2.71828 The exponential value of 2 is 7.38906
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