Compiling and decompiling the Fibonacci example on http://decompiler.fit.vutbr.cz/decompilation/

gistfile1.c

// Fibonacci numbers

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	int i, numtimes, number;
	unsigned value, fib();

	printf("Input number of iterations: ");
	scanf ("%d", &numtimes);
	for (i = 1; i <= numtimes; i++) {
		printf ("Input number: ");
		scanf ("%d", &number);
		value = fib(number);
		printf("fibonacci(%d) = %u\n", number, value);
	}
	exit(0);
}

unsigned fib(int x) { /* compute fibonacci number recursively */
    if (x > 2)
        return (fib(x - 1) + fib(x - 2));
    else
        return (1);
}

gistfile2.c

//
// This file was generated by the Retargetable Decompiler
// Website: http://decompiler.fit.vutbr.cz
// Copyright (c) 2011-2014 Lissom <decompiler@fit.vutbr.cz>
//

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

/* -------- Function Prototypes --------- */

int32_t _____fib(uint32_t plum);

/* ------------- Functions -------------- */

int main(int argc, char **argv) {
    printf("Input number of iterations: ");
    int32_t apple;
    scanf("%d", &apple);
    if (apple <= 0) {
        // 0x401596
        exit(0);
        // UNREACHABLE
        // branch -> 0x4015a2
    }
    // 0x4015a2
    printf("Input number: ");
    int32_t banana;
    scanf("%d", &banana);
    printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
    if (apple <= 1) {
        // 0x4015ef
        exit(0);
        // UNREACHABLE
        // branch -> 0x4015fb
    }
    // 0x4015fb
    printf("Input number: ");
    scanf("%d", &banana);
    printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
    if (apple <= 2) {
        // 0x401648
        exit(0);
        // UNREACHABLE
        // branch -> 0x401654
    }
    // 0x401654
    printf("Input number: ");
    scanf("%d", &banana);
    printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
    if (apple <= 3) {
        // 0x4016a1
        exit(0);
        // UNREACHABLE
        // branch -> 0x4016ad
    }
    // 0x4016ad
    printf("Input number: ");
    scanf("%d", &banana);
    printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
    if (apple < 5) {
        // 0x40174e
        exit(0);
        // UNREACHABLE
    }
    printf("Input number: ");
    scanf("%d", &banana);
    printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
    int32_t lemon = 6; // 0x40173f
    while (lemon <= apple) {
        // 0x4016fb
        printf("Input number: ");
        scanf("%d", &banana);
        printf("fibonacci(%d) = %u\n", banana, _____fib(banana));
        lemon += 1;
        // continue -> 0x4016fb
    }
    // 0x40174e
    exit(0);
    // UNREACHABLE
}

int32_t _____fib(uint32_t plum) {
    // 0x40175a
    int32_t result;
    if (plum >= 3) {
        int32_t orange = _____fib((int32_t)(plum - 1)); // 0x40176f
        result = _____fib(plum - 2) + orange;
        // branch -> 0x401796
    } else {
        result = 1;
    }
    // 0x401796
    return result;
}

/* --------- External Functions --------- */

// void exit (int)
// int printf (const char *restrict, ...)
// int scanf (const char *restrict, ...)

/* --------- Meta-Information ----------- */

// Detected compiler: gcc (mingw32-x86-pe) 4.7.3
// Detected functions: 2 (2 in front-end)
// Decompiler release: v1.5 (Nov 14 2013)
// Decompilation date: Jan 15 2014 13:31:36