如何在不使用toupper和ASCII值的情况下在C ++中将小写字母更改为大写字母字符？ [英] How do we change small letter to capital letter character in C++ without using toupper and ASCII value?

问题描述

我们不允许使用toupper或使用任何ASCII值。



我尝试过：



我无法得到任何解决方案。

We are not allowed to use toupper or do using any ASCII value.

What I have tried:

I am unable to get any solution.

推荐答案

你可以作弊：

You could cheat:

char c1 = 'a';
char c26 = 'z';
char upperC1 = (char)(c1 & 0xDF);
char upperC26 = (char)(c26 & 0xDF);
printf("%c:%c %c:%c\n", c1, upperC1, c26, upperC26);

查看ASCII表。大写字母A到Z的代码为0x41到0x5A，小写字母的代码为0x61到0x7A。



因为这看起来像家庭作业，我不会给你最终解决方案。但使用上述信息，您应该能够知道该怎么做。最后提示：

相应的大写和小写字母的代码有什么区别？

Have a look at the ASCII table. Upper case letters A to Z have codes of 0x41 to 0x5A and lower case letters have the codes 0x61 to 0x7A.

Because this looks like homework, I will not give you a final solution. But using the above information you should be able to know what to do. A final hint:
What is the difference in the code of corresponding upper case and lower case letters?

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