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下のコードのように小文字を大文字にしてみたいんだけど "*str -= ..." のところでBus errorが出るのはなぜ

Last updated at Posted at 2012-03-16
char* str = "Hello World";
while(*str)
{
  if('a' <= *str && *str <= 'z')                                                  
        *str -= ('a' - 'A'); 
  str++;
}
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