C++ -- ' ' 之前的预期主表达式

Question

我是 C++ 和编程新手，遇到了一个我无法弄清楚的错误。当我尝试运行该程序时，我收到以下错误消息:

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，我也尝试在单独的行上定义变量，但我最终得到了相同的错误消息。

任何人都可以就此提供一些建议吗？提前致谢!

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);
    }    
}

Answer 1

您在调用 wordLengthFunction() 时不需要“字符串”。

int wordLength = wordLengthFunction(string word);

应该是

int wordLength = wordLengthFunction(word);