string

1.

#include <iostream>
#include <string.h>
#include <stdio.h>
using namespace std;
void main()
{
	string test;
	char szBuffer[1024] = {0};
	char szBuffer02[1024] = {0};
	int a=1, b=2,c=3;
	sprintf(szBuffer,"%d,%d,%d",a,b,c );
	sprintf(szBuffer02,"%d,%d",a,b );
	test += szBuffer;
	test += ",";
	test += szBuffer02;
	cout<<szBuffer<<endl;
	cout<<szBuffer02<<endl;
	for(int i=0;i<strlen(test.c_str());i++)
	{
		cout<<test[i];
	}
	getchar();
}

2.

#include <iostream>
#include <string.h>
#include <stdio.h>
using namespace std;

void PutInt(string &src,int data)
{
	static bool once=false;
	char szBuffer[1024] = {0};
	sprintf(szBuffer,"%d",data );
	if(once)
		src += ",";
	src += szBuffer;
	once=true;
}
 void main()
{
	string test;
	for(int i=1;i<10;i++)
	{
		PutInt(test,i);
	}
	for(int i=0;i<strlen(test.c_str());i++)
	{
		cout<<test[i];
	}
	getchar();
}

3.

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

int main()
{
	istringstream iss("12 34");
	int a, b;
	iss >> a >> b;				//从字符串输入流iss中读取两个数
	cout << a << "，" << b << endl;
	string str;
	ostringstream oss(str);		//输出到string str中
	oss << a << " " << b;
	cout << oss.str() << endl;  //取出输出缓冲区的
	getchar();
	return 0;
}

4.replace

#include <iostream>
#include <string.h>
using namespace std;
int main()
{
	string result;
	string s = "AAAAAAAA";
	char ch = 'C';
	result = s.replace ( 1 , 3 , 4 , ch ); // s= "ACCCCAAAA
	for (int i = 0;i<result.size();++i)
	{
		cout<<result[i];
	}
	cout<<endl;
	system("pause");
	return 0;
}

5.substr

#include <iostream>
#include <string.h>
using namespace std;
int main()
{
	string s, ss;
	s = "The rain in Spain falls mainly in the plain."; 
	ss = s.substr(12, 5);			  // Spain 
	for(int i=0;i<ss.size();++i)
		cout<<ss[i];
	cout<<endl;
	ss = s.substr(12);                // Spain falls mainly in the plain.
	for(int i=0;i<ss.size();++i)
		cout<<ss[i];
	system("pause");
	return 0;
}

6.判断字符是中文还是英文

#include <iostream>
#include <string.h>
using namespace std;
int main()
{
	unsigned char input[50] = "fdasfasffff中文";
	int flag = 0;
	for (int i = 0; i < 50; i++)
	{
		if (input[i] > 0xa0 && input[i] != 0)
		{
			if (flag == 1)
			{
				cout << "chinese character" << endl;
				flag = 0;
			}
			else
			{
				flag++;
			}
		}
		else if (input[i] == 0)
		{
			break;
		}
		else
		{
			cout << "english character" << endl;
		}
	}
	system("pause");
	return 0;
}