关于C中字符数组，字符指针以及C++中string类型的两两转换及排序

// practise.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <string.h>#include <string>#include <algorithm>#include <iostream>using namespace std;int main(){    /* 字符串转字符数组，使用strncpy_s()，比strncpy()安全*/    string str = "abc xyz";    char strArray[11] = {0};    strncpy_s(strArray, str.c_str(), str.length());    printf("strArray: %s\n", strArray);    cout << strArray << endl;    /* 字符串转字符指针，直接调用c_str()*/    const char* strPointer = "";    strPointer = str.c_str();    printf("strPointer: %s\n", strPointer);    cout << strPointer << endl;    /* 字符指针转成字符串，直接赋值*/    char* strPointer1 = "bat hzx";    string str1 = strPointer1;    printf("str1: %s\n", str1.c_str());    /* 字符数组转成字符串，直接赋值*/    char strArray1[] = "hzx bat";    string str2 = strArray1;    printf("str2: %s\n", str2.c_str());    /* 字符指针转成字符数组，strncpy_s()*/    char* strPointer2 = "cheng du";    //int strLen = strlen(strPointer2);    //char strArray2[strLen] = {0};//error C2057: 应输入常量表达式    char strArray2[11] = {0};    strncpy_s(strArray2, strPointer2, strlen(strPointer2));    printf("strArray2: %s\n", strArray2);    /* 字符数组转成字符指针，直接赋值*/    char strArray3[16] = "Beijing China";    char* strPointer3;    strPointer3 = strArray3;    printf("strPointer3: %s\n", strPointer3);    /* 字符数组如何比较大小，使用strcmp()函数*/    char strArray4[8] = "abc";    char strArray5[8] = "abx";    char strArray6[8] = "abc";    printf("strArray4: %d  strArray5: %d  strArray6: %d\n", strArray4, strArray5, strArray6);    printf("is big: %d\n", strcmp(strArray4, strArray5));    printf("is big: %d\n", strcmp(strArray4, strArray6));    printf("is big: %d\n", strcmp(strArray5, strArray6));    /* 字符指针如何比较大小，使用strcmp()函数*/    char* strArray7 = "abc";    char* strArray8 = "aby";    char* strArray9 = "abc";    printf("strArray7: %d  strArray8: %d  strArray9: %d\n", strArray7, strArray8, strArray9);    printf("is big: %d\n", strcmp(strArray7, strArray8));    printf("is big: %d\n", strcmp(strArray7, strArray9));    printf("is big: %d\n", strcmp(strArray8, strArray9));    /* 字符指针和字符数组如何比较大小，使用strcmp()函数*/    char* strArray10 = "abc";    char strArray11[5] = "abz";    char* strArray12 = "abc";    printf("strArray10: %d  strArray11: %d  strArray12: %d\n", strArray10, strArray11, strArray12);    printf("is big: %d\n", strcmp(strArray10, strArray11));    printf("is big: %d\n", strcmp(strArray10, strArray12));    printf("is big: %d\n", strcmp(strArray11, strArray12));    /* 字符串如何比较大小，使用strcmp()+c_str()组合或者直接compare()*/    string str13 = "abc";    string str14 = "abx";    string str15 = "abc";    printf("str13: %d  str14: %d  str15: %d\n", str13, str14, str15);    printf("is big: %d\n", strcmp(str13.c_str(), str14.c_str()));    printf("is big: %d\n", strcmp(str13.c_str(), str15.c_str()));    printf("is big: %d\n", strcmp(str14.c_str(), str15.c_str()));    cout << str13.compare(str14) << endl;    cout << str13.compare(str15) << endl;    cout << str14.compare(str15) << endl;    return 0;}