循环结构

最新推荐文章于 2025-05-28 22:53:47 发布

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最新推荐文章于 2025-05-28 22:53:47 发布

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分类专栏： c++ 文章标签： c++ for

本文链接：https://blog.youkuaiyun.com/liuwei271551048/article/details/21468523

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本文详细介绍了C++中三种常见的循环结构：for循环、while循环和do-while循环，并通过具体示例展示了每种循环的应用场景及语法特点。

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①for循环:

基本用法:

int i;
for(i = 0; i < 5; i++)
{
     cout << i << endl;
}    //i在循环体外部还能使用

for(int i = 0; i < 5; i++)
{
   cout << i << endl;
}  //i只能在循环体内使用

使用实例：

#include <iostream>
using namespace std;

int main()
{
    int year[5], sum = 0;
    float average;
    cout << "The Amazing Accounto will sum and average five numbers for you." << endl;
    cout << "Please enter five values: " << endl;
    for(int i = 0; i < 5; i++)
    {
        cout << "Value " << i+1 << ": ";
        cin >> year[i];
    }
    for(int i = 0; i < 5; i++)
        sum += year[i];
    average = sum/5.0;
    cout << "Five exquisite choices indeed! They sum to " << sum << endl;
    cout << "and average to " << average << endl;
    cout << "The Amazing Accounto bids you adieu!" << endl;
    return 0;
}

②while循环

实例：

#include <iostream>

using namespace std;

int main()
{
    char name[20];
    int i = 0;
    cout << "Enter a name: ";
    cin >> name;
    while(name[i] != '\0')
    {
        cout << name[i] << ": " << int(name[i]) << endl;
        i++;
    }
    return 0;
}

③do-while循环

实例：

#include <iostream>

using namespace std;

int main()
{
    int n;
    cout << "Enter numbers in the range 1-10 to find my favorite number: " << endl;
    do
    {
        cin >> n;
    }while(n != 8);
    return 0;
}