# Output of C Programs | Set 14

Predict the output of below C programs.
Question 1

## C

 `#include` `int` `main()` `{` `   ``int` `a;` `   ``char` `*x;` `   ``x = (``char` `*) &a;` `   ``a = 512;` `   ``x = 1;` `   ``x = 2;` `   ``printf``(``"%d\n"``,a);`   `   ``getchar``();` `   ``return` `0;` `} `

Answer: The output is dependent on endianness of a machine. Output is 513 in a little endian machine and 258 in a big endian machine.
Let integers are stored using 16 bits. In a little endian machine, when we do x = 1 and x = 2, the number a is changed to 00000001 00000010 which is representation of 513 in a little endian machine. The output would be same for 32 bit numbers also.
In a big endian machine, when we do x = 1 and x = 2, the number is changed to 00000001 00000010 which is representation of 258 in a big endian machine.
Question 2

## C

 `int` `main()` `{` `  ``int` `f = 0, g = 1;` `  ``int` `i;` `  ``for``(i = 0; i < 15; i++) ` `  ``{` `    ``printf``(``"%d \n"``, f);` `    ``f = f + g;` `    ``g = f - g;` `  ``}` `  ``getchar``();` `  ``return` `0;` `}`

Answer: The function prints first 15 Fibonacci Numbers.
Question 3
Explain functionality of following function.

## C

 `int` `func(``int` `i)` `{` `  ``if``(i%2) ``return` `(i++);` `  ``else` `return` `func(func(i-1));` `}`

Answer: If n is odd then returns n, else returns (n-1). So if n is 12 then we get 11 and if n is 11 then we get 11.