C语言输入字符串大小写修改代码

Question

#include <stdio.h>

int main()
{
    int c;
    while ( (c = getchar()) != EOF )
    {
        if (c >= 65 && c <= 90)
            c += 32;
        else if (c >= 97 &&c <= 122)
            c -= 32;
        putchar(c);
    }
    return 0;
}

在代码中如何解释、处理和打印输入？

例如，如果我们输入abcde，我们得到输出ABCDE。当我们逐个字符地处理输入时，我们应该逐个字符地获取输出，但是一旦我们按下回车键，我们就会得到输出。直到我们按下回车键，输出存储在哪里。

Answer 1

有哪些功能？

• getchar() 是一个函数，用于从
  控制台。

putchar() is a function that is used to return the character written as an unsigned char cast to an int.

#include <stdio.h>
int main()
{
    int c;  
    while ( (c=getchar()) != EOF ){ 
        if (c >= 65 && c <= 90)
            c += 32;
        else if (c >= 97 &&c <= 122)
            c -= 32;
        putchar(c);
    }
  return 0;
}

c 是整数，因此当您从键盘读取字符时，它会将其存储为整数而不是字符。 checkout ASCII。

so 65 = A, 90 = Z, 97 = a, 122 = z,

这是我从代码中了解到的:

1. create variable c to store our character.
2. get character from user and store it to c.
3. while c is not equal to EOF(end of file)
4. if c is greater than or equal to 65 and c is less than or equal to 90
5. add 32 to c
6. or else if c is greater than 97 and c is less than or equal to 122
7. minus 32 from c
8. return c value into character and print it.