Linux's next classic C language interview question

Question

If you use the GCC compiler to execute the following program under Linux, what is the output result?

#include<stdio.h>
int main(){
    enum color{RED,BLUE,GREEN=-2,YELLOW,PINK};
    printf("%d  %d",BLUE,PINK);
    return 0;
}

I don’t understand very well. What’s the special syntax for enum type data in C language?

Original question source: Several classic interview questions in C language under Linux

Answer 1

When GREEN=-2, the subsequent data will be enumerated from -1, so RED=0, BLUE=1, GREEN=-2, YELLOW=-1, PINK=0