使用递归将一个基数提高到其指数 - C ++ [英] Using Recursion to raise a base to its exponent - C++

问题描述

我只想写一些使用函数递归来提高基数的代码。我知道递归不是最好的方式来做的事情在C + +，但我只是想探索的概念有点。程序询问用户一个基数和指数，然后控制输出答案。这是我写的程序：

  #include< iostream> 
 #include< math.h> 
 using namespace std; 
 
 int raisingTo（int，int）; 
 int main（）
 {
 int base，exponent; 
 cout<< 输入基本值：; 
 cin>>基础; 
 cout<< Enter exponent value：; 
 cin>>指数; 
 int answer = raisingTo（base，exponent）; 
 cout<< 答案是：< answer<< endl; 
 char response; 
 cin>>响应; 
 return 0; 
} 
 
 int raiseTo（int base，int exponent）
 {
 if（exponent> 0）
 return 1; 
 else if（exponent = 0）
 {
 int answer =（int）pow（（double）base，raisingTo（base，（exponent -1）））; 
 return answer;有趣的是，当我运行这个程序时，你可以使用一个程序来创建一个新的程序，它不断返回答案为'1'！ 
解决方案
 
  int raisingTo（int base，unsigned int指数）
 {
 if（exponent == 0）
 return 1; 
 else 
 return base * raisingTo（base，exponent  -  1）; 
} 
  
您有三个主要问题：
 
 
 
 
 
您不必使用pow函数
 
 
要比较数字，您应该使用 ==   = 是不比较的分配。
 
 
您错过了如果指数等于0， li> 
 
 
I simply want to write some code that makes use of recursion of functions to raise a base to its power. I know that recursion is not the most right way to do things in C++, but I just want to explore the concept a bit. The program asks the user for a base and an exponent and then console outs the answer. Here's the program I've written:
#include <iostream>
#include <math.h>
using namespace std;

int raisingTo(int, int);
int main()
{
    int base, exponent;
    cout << "Enter base value: ";
    cin >> base;
    cout << "Enter exponent value: ";
    cin >> exponent;
    int answer = raisingTo(base, exponent);
    cout << "The answer is: " << answer << endl;
    char response;
    cin >> response;
    return 0;
}

int raisingTo(int base, int exponent)
{
    if (exponent > 0)
        return 1;
    else if (exponent = 0)
    {
        int answer = (int) pow((double)base, raisingTo(base, (exponent - 1)));
        return answer;
    }
}
The funny thing is, when I run this program, it keeps returning the answer as '1'! Can someone please help me on this?
解决方案
int raisingTo(int base, unsigned int exponent)
{
    if (exponent == 0)
        return 1;
    else
        return base * raisingTo(base, exponent - 1);
}
You have 3 main problems:


You don't have to use pow function
To compare number you should use == as = is an assignment not compare.
You missed that if exponent is equal 0 you should return 1. 


                        
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