#include "stdafx.h"
#include "iostream"
#include "iomanip"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    string stringA = "Hello word"; //定义string类型的字符串
    cout << stringA << endl;
    string stringB(stringA);//用另一个字符串初始化字符串
    cout << "stringB= " << stringB << endl;
    string strCopy1, strCopy2;
    strCopy1 = stringA;//字符串之间的赋值运算
    cout << "strCopy1= " << strCopy1 << endl;
    strCopy2.assign(strCopy1);//将字符串赋值给本对象，相当于=操作
    strCopy2.append("programing");
    cout << "strCopy2= " << strCopy2 << endl;
    strCopy2.insert(6, "hello");
    cout << "strCopy2= " << strCopy2 << endl;
    string strADD = "in c++. ";
    stringB = stringA +  strADD;
    cout << "stringB = " << stringB << endl;

    int nLocation = stringA.find_first_of("WXYZ");
    cout << "The first position of w in stringA is " << nLocation << endl;
    int nCom = (stringB);
    cout << "compare of stringA and stringB is " << nCom << endl;

}
问题是cout<<string<<endl;//string前面的<<一直报错提示
1>          d:\app\visualstudio2013\vc\include\ostream(699): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const char *)”

string是类型名称，还是变量？

帮你代码排版了一下

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

int main( void )
{
    string stringA = "Hello word";
    cout << stringA << endl;

    string stringB(stringA);
    cout << "stringB= " << stringB << endl;

    string strCopy1;
    strCopy1 = stringA;
    cout << "strCopy1= " << strCopy1 << endl;

    string strCopy2;
    strCopy2.assign(strCopy1);
    strCopy2.append("programing");
    cout << "strCopy2= " << strCopy2 << endl;

    strCopy2.insert(6, "hello");
    cout << "strCopy2= " << strCopy2 << endl;

    string strADD = "in c++. ";
    stringB = stringA +  strADD;
    cout << "stringB = " << stringB << endl;

    int nLocation = stringA.find_first_of("WXYZ");
    cout << "The first position of w in stringA is " << nLocation << endl;

    int nCom = (stringB);
    cout << "compare of stringA and stringB is " << nCom << endl;
}

头文件<string>