[Bug c/25745] New: Nearly drove me crazy!

["jasun202002 at yahoo dot com" <gcc-bugzilla at gcc dot gnu dot org>]

the 50- line .c source was compiled on vc++  6 and ran without any errors (gave
needed results) but when compiled on gcc 4.0.1-5mdk i get a wicked logic error!
It nearly drove me crazy man! Below are the gcc specs... if u don't understand
this bug look at the plaing text source below (its only 50+ lines).


Using built-in specs.
Target: i586-mandriva-linux-gnu
Configured with: ../configure --prefix=/usr --libexecdir=/usr/lib
--with-slibdir=/lib --mandir=/usr/share/man --infodir=/usr/share/info
--enable-shared --enable-threads=posix --disable-checking
--enable-languages=c,c++,ada,f95,objc,java --host=i586-mandriva-linux-gnu
--with-system-zlib --enable-long-long --enable-__cxa_atexit
--enable-clocale=gnu --disable-libunwind-exceptions --enable-java-awt=gtk
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --enable-gtk-cairo
--disable-libjava-multilib
Thread model: posix



/*calculates mathematical constant e raised to the x power */

#include <stdio.h>

int main()
{
    short int x = 13, ov_increm = 1, y;
    double xPCount=0.000000;
    double fc_cum=1.000000;
    double k_e=1.000000;    /* this already takes care of the first '1' in the
formula */

    /*this prints the value of variable ov_increm...which gives 1*/
    printf("%hd\n", ov_increm);


    while( x > 12) {
        printf("Enter a value (<=12, >=1) for which to calculate the exponent:
");
        scanf("%d",&x);
        y=x;

        while ( y
 <= 0) {
            printf("Enter a value (<=12, >=1) for which to calculate the
exponent: ");
            scanf("%d",&y);
        }

        x=y;   
    }

    /*note that this variable is initialized in the declaration to 1... but it
prints 0 here*/
    printf("%hd\n", ov_increm);

    while( ov_increm <= 12 ) {

        fc_cum = fc_cum * ov_increm;         
        xPCount=(double)1;
  y = 1;



        while( y <= ov_increm ) {
            xPCount = xPCount * x;
            y++;    
        }

   k_e = k_e + (xPCount/fc_cum);   
        ov_increm++;
    }

    printf("\nThe value of mathematical constant 'e',\nraised to the power %d
is:%20.12f\n\n", x, k_e);
    return 0; 
}


-- 
           Summary: Nearly drove me crazy!
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jasun202002 at yahoo dot com
 GCC build triplet: 4.0.1-5mdk for Mandriva Linux release 2006.0
  GCC host triplet: gcc version 4.0.1
GCC target triplet: i586-mandriva-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25745