C++学习——四种字符串与数据连接的方法
#include <iostream>
#include <string>
#include <cstdlib>
#include <sstream>
#include <cstring>
using namespace std;
//第一种C风格的转化(以前一直喜欢的 sprintf 功能强大)
void test()
{
char *s = "dong";
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 test1()
{
string s = "dong";
int a = 520;
char *buf = new char[10];//2147483647 int最大值
_itoa(a, buf, 10); //itoa虽然可以转化为各种进制，但是注意不能是float或者double
cout << s + buf << " | ";
_itoa(a, buf, 16);
cout << s + buf << endl;
}
//纯C++风格
void test2()
{
string s = "陈明东";
int a = 52;
double b = .1314;
ostringstream oss;
oss << s << a << b;
cout << oss.str() << endl;
}
//C++11新特性
void test3()
{
int a = 520;
float b = 5.20;
string str = "dong";
string res = str + to_string(a);
cout << res << endl;
res = str + to_string(b);
res.resize(8);
cout << res << endl;
}
int main()
{
test();
test1();
test2();
test3();
return 0;
}