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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     char x, y;
  5.     printf("a,b");
  6.     scanf(" %c %c", &x, &y);
  7.  
  8.     if (x >= 'a' && x <= 'z') 
  9.         x = x - 32;  // 小写转大写
  10.     else 
  11.         x = x + 32;  // 大写转小写
  12.  
  13.     if (y >= 'a' && y <= 'z') 
  14.         y = y - 32;  
  15.     else 
  16.         y = y + 32;  
  17.  
  18.     printf("A,B %c %c\n", x, y);
  19.     return 0;
  20. }
Success #stdin #stdout 0.01s 5296KB
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stdin
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Standard input is empty
stdout
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a,bA,B
https://ideone.com/Jc50WX
language:
C (gcc 8.3)
created:
16 hours ago
visibility:
public

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