#include<stdio.h>
#include<Windows.h>
void reverse(char* arr) {
	char* left = arr;
	char* right = arr+ strlen(arr) - 1;
	while (left < right) {
		char temp = *left;
		*left = *right;
		*right = temp;
		left++;
		right--;
	}

}
int main() {
	int i = 0;
	char arr[] = "i like beijing";
	reverse(arr);
    printf("%s", arr);
	return 0;
}