How is the result is "Sololearn" here? Could someone explain please?

Question

#define SOLO 42
int main() {
#if !SOLO
printf("Try Again");
#else
printf("SoloLearn");
#endif
return 0;
}

Answer 1

When "SOLO" is replaced by 42, the condition !SOLO is evaluated to false since all non-zero values are considered to be true, thus the negation is false. As a result, only the code inbetween the #else and #endif directives is compiled, making the output "SoloLearn".

Answer 2

Thanks for effort Shadow