explicit keywords
On this key principle only constructor function, inhibition of negative conversion, for example:
class String{
String(int size); //本意是要申请size大小的字符串
};If the call at this time
String s1(20); //成功申请20个大小长度的字符串
String s2 = 20; //同上
String s3 = 'a'; //本意是要把a赋值给s3,结果是 申请了a字符对应大小的字符串In this case the original becomes a function declaration
class String{
explicit String(int size);
};This will suppress s3 = 'a' stealth conversion
static_cast
Use a temporary reconstruction of the original value of the object, and use the type conversion when setting up the initial value
Such as
float x;
cout << static_cast<int>(x)<<endl; //把x转换为float输出
Standard C ++ main () Definition Format
int main(){
...
}
int main(int argc,char* argv[]){
...
}The last may be omitted return 0; automatically add an implicit return 0;
Reproduced in: https: //my.oschina.net/u/204616/blog/545020