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#include <bits/stdc++.h>
using namespace std;
int main() {
printf("hello world\n");
//两种方式是等价
cout << "a" << 1 << "b" << endl;
printf("%s%d%s\n","a",1,"b");
//将数字转为字符串
ostringstream stream;
stream << 1; //n为要转字符串的整数
string s = stream.str();
printf("a%sb\n", s.c_str());
//转义
printf("%s","%s");
return 0;
}