C语言检测字符串长度

VC++6.0编译

#include "stdafx.h"
#include 
int GetLen(char * str)
{

 int count = 0;
 char * p;
 p = str;

 while(*p!='\0')
 {
  count ++;
  p++;
 }

 return count;

}


int main()
{
 char mystring[20];
 scanf("%s",mystring);
 int len ;
 len = GetLen(mystring);

 printf("the len is %d\n",len);
 
 return 0;
}