#include <stdio>
int main(void)
{
int i=0;
char string[100];
strcpy(string,"abcdefghijklmnopqrstuvwxyz");
while (string[i]!='\0'){ //将小写转化成大写
if (islower(string[i]))
string[i]=toupper(string[i]);
i++;
}
printf("%s\n",string);
return 0;
}
deepfuture@deepfuture-laptop:~/private/mytest$ ./test15ABCDEFGHIJKLMNOPQRSTUVWXYZ
7666

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