RE: [Dev-C++] Fibonacci numbers / unsigned long long int

[<Mat...@Ve...>]

Try the option -std=c99 as one of your GCC options. The long long integer
type only works right in C99 C code. Let me know how it turns out.

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...]On Behalf Of Dion
Bouwer
Sent: Sunday, March 06, 2005 9:18 PM
To: dev...@li...
Subject: [Dev-C++] Fibonacci numbers / unsigned long long int


Hello

The following code, when assembled by dev-cpp calculates the incorrect 49th
Fibonacci number, which should be 4807526976. However, when compiled by
another assembler (lc.exe), it works fine.

The 47th Fibonacci (1836311903) and 48th Fibonacci (2971215073) are 
calculated correctly, but when they're added together to create the 49th 
Fibonacci, the answer is incorrectly calculated and displayed.

Does Dev-C have to be configured in any special way to handle unsigned 
long long integers?
 
/* Generate Fibonacci numbers using variable length arrays  */
 
#include <stdio.h>
 
int main (void)
{
    int i, numFibs;
 
    printf ("How many Fibonacci numbers do you want (between 1 and 75)?");
    scanf ("%i", &numFibs);
 
    if ( numFibs < 1 || numFibs > 75 ) {
       printf ("\nNumber must be between 1 and 75!!\n");
       return (1);
    }
 
    unsigned long long int Fibonacci[numFibs];
 
    Fibonacci[0] = 0;  // by definition
    Fibonacci[1] = 1;  // by definition
 
    for ( i = 2; i < numFibs; ++i )
        Fibonacci[i] = Fibonacci[i-2] + Fibonacci[i-1];
 
    for ( i = 0; i < numFibs; ++i )
        printf ("%llu\n", Fibonacci[i]);
 
    printf ("\n");
 
    return (0);
}



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