C program to reverse a string

Code:

	#include<stdio.h>
	void main()
	{
	char str[100],rstr[100];
	int i,j,lenstr,k;
	printf("\nEnter a string \t:");
	scanf("%s",str);
	for(i=0;str[i]!='\0' ;i++);
	lenstr=i;
	for(j=lenstr-1,k=0;j!=-1;j--,k++)
	{
	rstr[k]=str[j];
	}
	rstr[k]='\0';
	printf("\n%s",rstr);
	}

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