Day#21 'C' Coding Challenge

What is the output of the below code?

#include<stdio.h> int sum(int,int); int k; void main() { int (*ptr)() = sum; (*ptr)(); printf("%d",k); } int sum(int a, int b) { a = b = 3; k = a + b; return k; }

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The code tests the below scenarios:

1. Function pointer

2. Function definition and declaration

3. Global variables

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ptr is a function pointer.

int (*ptr)() = sum;

With (*ptr) (), sum function is called

(*ptr)();

The sum function gets executed, 

a,b are local variables, k is global variable

k holds the value 6

with return k statement, 6 is returned and is printed.