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  1. #include <stdio.h>
  2. #define MAX_CHAR 100
  3. int main(void) {
  4.  char str[MAX_CHAR+1];
  5.  int i;
  6.  
  7.  printf("文字列を入力してください: ");
  8.  scanf("%s", str);
  9.  
  10.  for (i = 0; str[i] != '\0'; i++) {
  11.   if (str[i] >= 'a' && str[i] <= 'z') {
  12.    str[i] = str[i] - 'a' + 'A';
  13.   }
  14.   else if (str[i] >= 'A' && str[i] <= 'Z') {
  15.    str[i] = str[i] - 'A' + 'a';
  16.   }
  17.  }
  18.  
  19.  printf("変換した文字列: %s\n", str);
  20.  
  21.  return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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poiuA
stdout
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文字列を入力してください: 変換した文字列: POIUa
https://ideone.com/UcDnlE
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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