Output of C code

Question

Can someone explain what this code does?
#include <stdio.h>

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

https://code.sololearn.com/c2a0j6mMWt5f/#c

Answer 1

#if !SOLO //it means if not SOLO defined,
{
printf("Try Again"); //execute this
}
#else. //else, SOLO defined then
{
printf("SoloLearn"); //execute this.
}
#endif

This is same as if - else by macros.
Then code not defined SOLO macro constant anywhere, so if part is not(SOLO) is true. (SOLO not defined) then it prints Try again.

Check by adding
#define SOLO 1
It prints else part.
Hope this helps..

Answer 2

thank you very much!

Answer 3

Edward Finkelstein your welcome...