C Preprocessor - C Programming Questions and Answers

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What will be output after executing following code?

#include
# define a 10
void main()
{
    printf("%d..", a);
    foo();
    printf("%d", a);
}
void foo()
{
   #undef a
   #define a 50
}

10..50

10..10

Error

The output of the following program is:

#define f(g,g2) g##g2
void main()
{
   int var12=100;
   printf("%d", f(var,12));
}

Syntax error

Runtime error

g##g2

100

10012

Find the output of the following program.

#define INC(X) X++
void main()
{
   int x=4;
   printf("%d", INC(x++));
}

Error

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