c++ string构造函数和assign函数

bantinghy

已于 2025-04-18 11:58:23 修改

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分类专栏： C++ 文章标签： c++ 开发语言

于 2025-04-18 11:50:56 首次发布

本文链接：https://blog.youkuaiyun.com/u011743621/article/details/147323948

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c++ string构造函数和assign函数

#include <iostream>
#include <stdlib.h>
#include <string>
#include <string.h>

int main()
{
	char buff[10] = {'a','b','c','d','e','f','g','h','i','\0'};
	std::string str1;
	str1.assign(&buff[0],0,10);
	int length = str1.length();
	int len    = strlen(str1.c_str());
	std::cout<<"test1: length="<<length<<",len="<<len<<std::endl;
	
	std::string str2 = std::string((char*)&buff[0],10);
	length = str2.length();
	len    = strlen(str2.c_str());
	std::cout<<"test2: length="<<length<<",len="<<len<<std::endl;

	std::string str3 = str2;
	length = str3.length();
	len    = strlen(str3.c_str());
	std::cout<<"test3: length="<<length<<",len="<<len<<std::endl;

	std::string str4;
	str4.assign(str3.c_str(),strlen(str3.c_str()));
	length = str4.length();
	len    = strlen(str4.c_str());
	std::cout<<"test4: length="<<length<<",len="<<len<<std::endl;
	
	return 0;	
}

[banting@localhost test]$ vim test.cpp
[banting@localhost test]$ g++ -g test.cpp -o test
[banting@localhost test]$ ./test
test1: length=9,len=9
test2: length=10,len=9
test3: length=10,len=9
test4: length=9,len=9
[banting@localhost test]$