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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; }
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
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