C ++-''之前的预期主表达式 [英] C++ -- expected primary-expression before ' '

问题描述

我不熟悉C ++和编程，遇到了一个我无法弄清的错误.当我尝试运行该程序时，出现以下错误消息:

I am new to C++ and programming, and have run into an error that I cannot figure out. When I try to run the program, I get the following error message:

stringPerm.cpp: In function ‘int main()’:
stringPerm.cpp:12: error: expected primary-expression before ‘word’

在将变量分配给函数之前，我还尝试过在单独的行上定义变量，但最终还是得到相同的错误消息.

I've also tried defining the variables on a separate line before assigning them to the functions, but I end up getting the same error message.

有人可以提供一些建议吗?预先感谢！

Can anyone offer some advice about this? Thanks in advance!

请参见下面的代码:

#include <iostream>
#include <string>
using namespace std;

string userInput();
int wordLengthFunction(string word);
int permutation(int wordLength);

int main()
{
    string word = userInput();
    int wordLength = wordLengthFunction(string word);

    cout << word << " has " << permutation(wordLength) << " permutations." << endl;
    
    return 0;
}

string userInput()
{
    string word;

    cout << "Please enter a word: ";
    cin >> word;

    return word;
}

int wordLengthFunction(string word)
{
    int wordLength;

    wordLength = word.length();

    return wordLength;
}

int permutation(int wordLength)
{    
    if (wordLength == 1)
    {
        return wordLength;
    }
    else
    {
        return wordLength * permutation(wordLength - 1);
    }    
}

推荐答案

调用 wordLengthFunction()时不需要字符串".

You don't need "string" in your call to wordLengthFunction().

int wordLength = wordLengthFunction(字符串词);

应该是

int wordLength = wordLengthFunction(word);

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