To print the entered string in reverse order without using library function

Lets learn something new about string.In this  page I have made a program to find the reverse order of the entered string without using standard library function.  For more idea have a look at the source code and the printed output given below:
The output of the above program is given below:

The source code of the above output is:

	#include<stdio.h>
	#include<conio.h>
	#include<string.h>
	int main()
	{
	char s[100], temp;
	int i,j,l;
	printf("enter the string whose reverse order is to be find\n");
	gets(s);
	l=strlen(s);
	for(i=0;i<=l/2;i++)
	{
	for (j=l-1;j>=l/2;j--)
	{
	if(i+j==l-1)
	{
	temp=s[j];
	s[j]=s[i];
	s[i]=temp;
	}
	}
	}
	printf("the reverse string is %s",s);
	getch();
	}

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