gistfile1.cpp

#include <iostream>
using namespace std;

void reverse(char* str){
    char* end = str;	
	char temp;
	while(*end != '\0'){
		end++;
	}
	end--;
	while(end > str){
		temp = *end;
		*end = *str;
		*str = temp;
		str++;
		end--;
	}
}

int main() {
	char str1[] = "This is a test.";
	reverse(str1);
	cout << str1 << endl;
	return 0;
}