C ++使用for循环反向打印字符串 [英] C++ Printing a string in reverse using a for loop

问题描述

我有一个使用for循环打印出字符串字符的程序.它还必须反向打印相同的字符，这就是我遇到的问题.有人可以帮我弄清楚为什么第二个for循环未执行的原因吗?

I have a program that prints out the characters of a string using a for-loop. It must also print the same characters in reverse, which is where I'm having problems. Can someone help me figure out why the second for-loop isn't executing?

int main()
{
    string myAnimal;

    cout << "Please enter the name of your favorite animal.\n";
    cin >> myAnimal;

    // This loop works fine
    int i;
    for(i = 0; i < myAnimal.length(); i++){
        cout << myAnimal.at(i) << endl;
    }

    // This one isn't executing
    for(i = myAnimal.length(); i > -1; i--){
        cout << myAnimal.at(i) << endl;
    }
    return 0;
}

推荐答案

您需要首先将i赋给长度减去1或数组中的最后一个索引值.

You need to assign i initially to the length minus one, or the last index value in the array.

for(i = myAnimal.length()-1; i >= 0; i--){
    cout << myAnimal.at(i) << endl;
}

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