左旋字符串

#include "stdafx.h"#include <iostream> using namespace std;char* reverse(char* str, int begin, int end){char temp;while(begin<end){temp = str[end];str[end--] = str[begin];str[begin++] = temp;}return str;}char* left_shift(char *str, int K){int N=strlen(str);K %= N;//cout<<str<<" "<<endl;reverse(str, 0, K -1);//cout<<str<<"  "<<endl;reverse(str, K, N - 1);//cout<<str<<" "<<endl;reverse(str, 0, N - 1);//cout<<str<<" "<<endl;return str;}int main(){char str[] = "abcde123";cout<<"before rotate is "<<str<<endl;cout<<"the result is "<<left_shift(str,3)<<endl;return 0;}