How scanf works if I add a new line '\n' at the end

Question

#include 
int main(){

    int a,b,c;

    scanf(\"%d%d%d\\n\",&a,&b,&c);
    printf(\"%d %d %d\",a,b,c);

    return 0;
}

Answer 1

A white character in scanf format matches a sequence of white characters in the input until a non-white character.

Newline is a white character and this explains the behavior of your program. Meaning that if your scanf format terminates by a newline, it does not finish until it sees an additional non-blank character after the last parsed input.