toupper返回整数而不是char [英] toupper returns integer rather than char

问题描述

用于以下函数

void display()
{
    for (int i = 0; i < 8; i++)
    {
        for (int j = 0; j < 8; j++)
        {
            if (board[i][j] < 84 && (i+j)%2 == 0)
                SetConsoleTextAttribute( GetStdHandle( STD_OUTPUT_HANDLE ), 0x70);
            else if (board[i][j] < 84 && (i+j)%2 == 1)
                SetConsoleTextAttribute( GetStdHandle( STD_OUTPUT_HANDLE ), 0xc0);
            else if (board[i][j] > 97 && (i+j)%2 == 0)
                SetConsoleTextAttribute( GetStdHandle( STD_OUTPUT_HANDLE ), 0x7c);
            else if (board[i][j] > 97 && (i+j)%2 == 1)
                SetConsoleTextAttribute( GetStdHandle( STD_OUTPUT_HANDLE ), 0xc7);
            cout << " " << toupper(board[i][j]) << " ";
        }
        cout << endl;
    }
}

[8]它返回整数，所以我的输出看起来像

instead of returning chars for the char board[8][8] it returns integers so my output looks like

 82  78  66  81  75  66  78  82

 80  80  80  80  80  80  80  80 

 32  32  32  32  32  32  32  32 

 32  32  32  32  32  32  32  32 

 32  32  32  32  32  32  32  32 

 32  32  32  32  32  32  32  32 

 80  80  80  80  80  80  80  80 

 82  78  66  81  75  66  78  82 

而不是预期的输出

 R  N  B  Q  K  B  N  R

 P  P  P  P  P  P  P  P




 P  P  P  P  P  P  P  P

 R  N  B  Q  K  B  N  R

我也试过声明一个char a = board [i] [j] cout < toupper（a）;尝试将变量类型确认为一个字符并接收相同的输出。

I have also tried declaring a char a = board[i][j]; cout << toupper(a); in an attempt to confirm the variable type as a character and received the same output.

这是一个类的赋值，所以我不期望很多帮助，我只是想知道为什么我的函数是返回整数代替字符，所以我知道我的错误是为了未来的参考，谷歌没有多大帮助。是toupper的某种范围问题吗？

this is an assignment for a class so i don't expect much help, i just want to know why my function is returning integers in place of chars so that i know what my mistake is for future reference, Google didn't help much. is it some sort of scope issue with toupper?

推荐答案

Toupper函数返回大写等于c的值，如果这样的值存在， c（不变）。该值作为int值返回，可以隐式转换为char。

Toupper function returns the uppercase equivalent to c, if such value exists, or c (unchanged) otherwise. The value is returned as an int value that can be implicitly casted to char.

http://www.cplusplus.com/reference/cctype/toupper/

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