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The extra backslash character does not affect my program. What for?

This code will work and work fine with g ++. I do not know why. This should result in an error.

#include <iostream>
using namespace std;
int main(){
    int x=9;
    int y=6;
    //note that there is extra backslash in the end of if statement
    if(x==y)\
    {
        cout<<"x=y"<<endl;
    }
    //note that there is extra backslash in the end of if statement
    if(x!=y)\
    {
        cout<<"x!=y"<<endl;
    }
    return 0;
}
+5
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2 answers

From the C ++ standard:

(C ++ 11, 2.2p1) "Each instance of a backslash character (\) immediately followed by a newline character is deleted by splicing the physical source lines to form the logical lines of the source code. Only the last backslash on any physical source line shall be entitled to be part of such a merger. "

C says exactly the same:

(C11, 5.1.1.2 p1) " (\), , , ."

:

if(x==y)\
{
    cout<<"x=y"<<endl;
}

:

if(x==y){
    cout<<"x=y"<<endl;
}
+19

\ . g++ if(x==y){ , .

+6

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