C语言基础：如何使用指针遍历字符数组转换字符串为大写

C语言基础：通过指针遍历字符数组转换字符串为大写

#include <stdio.h>
#include <ctype.h>
char *string_uppercase(char *string)
 {
   char *starting_address;
   starting_address = string;
   while (*string)
     toupper(*string++);
   return(starting_address);
 }
int main(void)
 {
   char *title = "Jamsa's 1001 C/C++ Tips";
   char *string;
   string = string_uppercase(title);
   printf("%s\n", string);
   printf("%s\n", string_uppercase("Arrays and Pointers"));
return 1;
 }