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  1. #include <stdio.h>
  2.  
  3. int main() 
  4. {
  5.     char x, y;
  6.     printf("a,b");
  7.     scanf(" %c %c", &x, &y);
  8.  
  9.     if (x >= 'a' && x <= 'z') 
  10.         x = x - 32;  // 小写转大写
  11.     else 
  12.         x = x + 32;  // 大写转小写
  13.  
  14.     if (y >= 'a' && y <= 'z') 
  15.         y = y - 32;  
  16.     else 
  17.         y = y + 32;  
  18.  
  19.     printf("%c %c\n", x, y);
  20.     return 0;
  21. }
Success #stdin #stdout 0s 5276KB
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stdin
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Standard input is empty
stdout
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a,b
https://ideone.com/XF2wYT
language:
C (gcc 8.3)
created:
16 hours ago
visibility:
public

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