kasteluo的专栏

方法一    加减运算： { int a = 3; int b = 23; cout<< "a="<<a<<endl; cout<< "b="<<b<<endl; a = a+b; b = a-b; a = a-b; cout<< "a="<<a<<endl;

方法一：自定义函数 char Toupper(char c) { if('a' <= c && c <= 'z') c = c + 'A' - 'a'; return c; } std::string str = "hello world1"; transform(str.begin(), str.end(),str.begin(),