How to use >= in comparing with 0? Is this code is right? Please answer

Question

#include<stdio.h>
int main()
{
int a;
scanf("%d ", &a);
if( a >= 0)
printf("Ok");
else
printf("Not ok");
return 0;
}

Answer 1

what do you mean by "this code is right?"?
Your code prints "Ok" for integers greater or equal to 0 and "Not ok" for integers less than 0 (negatives).
if this is what you want then it's right.