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Complicated Declarations - Programming

Q1:

Point out the error in the following program. 
#include<stdio.h>
void display(int (*ff)());

int main()
{
    int show();
    int (*f)();
    f = show;
    display(f);
    return 0;
}
void display(int (*ff)())
{
    (*ff)();
}
int show()
{
    printf('AptitudeCrack');
}

A Error: invalid parameter in function display()

B Error: invalid function call f=show;

C No error and prints "AptitudeCrack"

D No error and prints nothing.

ANS:A - Error: invalid parameter in function display()

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