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Declarations and Initializations - Programming

Q1:

Point out the error in the following program. 
#include<stdio.h>
int main()
{
    int (*p)() = fun;
    (*p)();
    return 0;
}
int fun()
{
    printf('AptitudeCrack.com\n');
    return 0;
}

A
Error: in int(*p)() = fun;

B
Error: fun() prototype not defined

C No error

D None of these

ANS:A -

Error: in int(*p)() = fun;

The compiler will not know that the function int fun() exists. So we have to define the function prototype of int fun();
To overcome this error, see the below program 

#include<stdio.h>
int fun(); /* function prototype */

int main()
{
    int (*p)() = fun;
    (*p)();
    return 0;
}
int fun()
{
    printf('AptitudeCrack.com\n');
    return 0;
}