c-字符串小写转大写

 

 

#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$ ./test15

ABCDEFGHIJKLMNOPQRSTUVWXYZ