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@salem thankyou for your answer I agree to your point..but then what about the following code

int foo(){return 5;}int main(){ printf("%d",sizeof(foo())); return 0;}
here the call to foo() is...

Is the sizeof operator in c a compile time or run time operator..Because the following code works fine with a gcc compiler

int a;
scanf("%d",&a);
printf("%d",sizeof(a));But I...