C++中4种方式把字符串和数字连接起来(转载)

版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/PROGRAM_anywhere/article/details/63720261


以前老用Java里面的String类,用过的人都知道好舒服,连接字符串和数字只需要用一个 + 号就可以了。在这里真的想把C++中string类+号功能加强一下。希望有能力的人可以做一下,不然总是感觉string类缺点啥呢(每次都和java比 O(∩_∩)O哈哈~)
不废话了,如题直接晒代码

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


转载自:https://blog.csdn.net/program_anywhere/article/details/63720261


版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/PROGRAM_anywhere/article/details/63720261


以前老用Java里面的String类,用过的人都知道好舒服,连接字符串和数字只需要用一个 + 号就可以了。在这里真的想把C++中string类+号功能加强一下。希望有能力的人可以做一下,不然总是感觉string类缺点啥呢(每次都和java比 O(∩_∩)O哈哈~)
不废话了,如题直接晒代码

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


转载自:https://blog.csdn.net/program_anywhere/article/details/63720261


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