#include <iostream>

#include <string>

#include <sstream>

using namespace std;

int main(){

testFirst();

testSecond();

testThr();

return 0;

}

/**

* 第一种C风格的转化

*

* sprintf 功能强大

*/

void testFirst(){

char *s = “hello”;

int a = 52;

float b = .1314;

char *buf = new char[strlen(s) + sizeof(a) + 1];

sprintf(buf, “%s%d%.4f”, s, a, b);

printf(“%s\n”, buf);

}

/**

* 半C半C++风格

*/

void testSecond(){

string s = “dong”;

int a = 520;

//2147483647 int最大值

char *buf = new char[10];

//itoa虽然可以转化为各种进制，但是注意不能是float或者double

_itoa(a, buf, 10);

s += buf;

cout << s << “\t”;

_itoa(a, buf, 16);

s += buf;

cout << s << endl;

}

/**

* 纯C++风格

*/

void testThr(){

string s = “中国”;

int a = 520;

double b = .1314;

ostringstream oss;

oss << s << a << b << endl;

cout << oss.str() << endl;

}

/*

*

输出结果

hello520.1314

hello520 dong520208

中国5200.1314

*/