Question
Will the program compile successfully?
#include<stdio.h>
int main()
{
#ifdef NOTE
int a;
a = 10;
#else
int a;
a=20;
#endif
printf("%d`setminus`n" , a)'
return 0;
}
Answer: Option A
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Yes, this program will compile and run successfully and prints 20.
The macro #ifdef NOTE evaluates the given expression to 1. If satisfied it executes the
#ifdefblock statements. Here #ifdef condition fails because the Macro NOTE is nowhere declared.
Hence the #else block gets executed, the variable a is declared and assigned a value of 20.
printf("%dn", a); It prints the value of variable a 20.
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