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拼接成字符串string
2020-05-28
C++

拼接成字符串string

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

//C风格
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;
}
/*
dong520.1314
dong520 | dong208
陈明东520.1314
dong520
dong5.20
*/

C++中4种方式把字符串和数字连接起来

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