Question

编译时出现此错误：

$ gcc ArraysOfCharStrings1.cpp  -lstdc++ -o ArraysOfCharStrings1 
ArraysOfCharStrings1.cpp: In function 'char* int2month(int)':
ArraysOfCharStrings1.cpp:11: error: invalid conversion from 'const char' to 'char*'
ArraysOfCharStrings1.cpp:30: error: invalid conversion from 'const char*' to 'char*'

我正试图从一本书C ++中学习字符串数组的使用并使该程序有效：

#include <iostream>
#include <stdio.h>

// int2month() - return the name of the month
char* int2month(int nMonth)
{
    // first check for a value out of range
    if (nMonth < 1 || nMonth > 12)
    {
        const char* noGood = "invalid";
        return noGood; 

    }

    // nMonth is valid - return the name of the month
    const char* pszMonths[] = {"invalid",
                       "January",
                       "February",
                       "March",
                       "April",
                       "May",
                       "June",
                       "July",
                       "August",
                       "September",
                       "October",
                       "November",
                       "December"};

    return (pszMonths[nMonth]);
}


int main(int nArg, char* pszArgs[])
{
    const char* response = int2month(1);
    std::cout << response << "\n";

    return 0;
}

我看到其他人回答并尝试了响应，但是我没有成功使程序运行。

Answer 1

您正在尝试从char *函数返回const char *值

C:\Windows\System32\drivers\etc

如果将const放到函数中；

char* int2month(int nMonth)
{

if (nMonth < 1 || nMonth > 12)
{
    const char* noGood = "invalid";
    return noGood;    //cannot return *char value
}
//other code
}

它将起作用

返回一个字符数组

1 个答案: