/*reverse .c				*/
/*reverse the content of a string	*/
/*author: Weiwei Chen			*/
/*Date: Nov. 21. 2010			*/

#define SLEN 128	/*the maximum length of the string*/

#include <stdio.h>	

int getStrLength(char str[SLEN])
{
	char* p = str;
	int i = 0;
	
	while(*p++) 
	{
		i ++;
	}

	return i;
}

void reverse(char str[SLEN], int size)
{
	int mid, i;
	char tmp;

	mid = size / 2;

	for(i = 0; i < mid; i ++)
	{
		tmp = str[i];
		str[i] = str[size - 1 - i];
		str[size - 1 - i] = tmp;
	}
	return;
}


int main()
{
	char mystring[SLEN], len;

	printf("Please input a string: ");
	scanf("%127s", mystring);	/*get the input string		*/
	
	len = getStrLength(mystring);	/*get the length of the string	*/
	reverse(mystring, len);		/*reverse the content		*/
	printf("The reversed string is: %s\n", mystring);

	return 0;
}