Gcc Floating Point Exception Error
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Floating Point Exception (core Dumped)
–shinkou May 8 '13 at 18:02 in your main() the variable c have no value assigned. –Gisway May 8 '13 at 18:04 1 try the following steps next time, 1) compile gcc -g your_c_file, then either 2) gdb a.out or 3) valgrind a.out. both are excellent debugging tools which comes for free –abasu May 8 '13 at 18:11 1 +1 for a small, yet compilable code example that reproduces the error. –moooeeeep May 8 '13 at 18:51 add a comment| 4 Answers 4 active oldest votes up vote 7 down vote accepted What should I do to resolve this problem? The first thing to address this problem would be to have a look at the hints your compiler is able to provide you. That is, enable warnings (-Wall) and debugging symbols (-g): $ gcc test.c -Wall -g test.c: In function ‘main’: test.c:25:11: warning: ‘c’ may be used uninitialized in this function [-Wuninitialized] There may be something wrong with the variable c in line 25, which is exactly the print statement: printf("%d",(b%c)); Let's see what happens when we run it: $ ./a.out 1 2 3 Floating point exception (core dumped) Ah, well, it fails. But how did it crash? That's a use case for gdb: $ gdb ./a.out GNU gdb (GDB) Fedora (7.5.1-37.fc18) Copyright (C) 2012 Free Software Founda
exception occurs. This sigfpe arithmetic exception can be useful for finding the cause of an gdb tutorial unexpected infinity or NaN. The current handler settings can be shown with the command info signal http://stackoverflow.com/questions/16447275/floating-point-exception-without-division-by-zero SIGFPE. (gdb) info signal SIGFPE Signal Stop Print Pass to program Description SIGFPE Yes Yes Yes Arithmetic exception Unless the program uses a signal handler the default setting should be changed https://www.gnu.org/s/gsl/manual/html_node/Handling-floating-point-exceptions.html so that SIGFPE is not passed to the program, as this would cause it to exit. The command handle SIGFPE stop nopass prevents this. (gdb) handle SIGFPE stop nopass Signal Stop Print Pass to program Description SIGFPE Yes Yes No Arithmetic exception Depending on the platform it may be necessary to instruct the kernel to generate signals for floating point exceptions. For programs using GSL this can be achieved using the GSL_IEEE_MODE environment variable in conjunction with the function gsl_ieee_env_setup as described in see IEEE floating-point arithmetic. (gdb) set env GSL_IEEE_MODE=double-precision
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Web Development GUI Toolkits/Desktop Databases Mail Systems openSolaris Eclipse Documentation Techotopia.com Virtuatopia.com How To Guides Virtualization General System Admin Linux Security Linux Filesystems Web Servers Graphics & Desktop PC Hardware Windows Problem Solutions <<< previous table of contents next >>> 8.6 Floating-point issues The IEEE-754 standard defines the bit-level behavior of floating-point arithmetic operations on all modern processors. This allows numerical programs to be ported between different platforms with identical results, in principle. In practice, there are often minor variations caused by differences in the order of operations (depending on the compiler and optimization level) but these are generally not significant. However, more noticeable discrepancies can be seen when porting numerical programs between x86 systems and other platforms, because the the x87 floating point unit (FPU) on x86 processors computes results using extended precision internally (the values being converted to double precision only when they are stored to memory). In contrast, processors such as SPARC, PA-RISC, Alpha, MIPS and POWER/PowerPC work with native double-precision values throughout.(26) The differences between these implementations lead to changes in rounding and underflow/overflow behavior, because intermediate values have a greater relative precision and exponent range when computed in extended precision.(27) In particular, comparisons involving extended precision values may fail where the equivalent double precision values would compare equal. To avoid these incompatibilities, the x87 FPU also offers a hardware double-precision rounding mode. In this mode the results of each extended-precision floating-point operation are rounded to double precision in the floating-point registers by the FPU. It is important to note that the rounding only affects the precision, not the exponent range, so the result is a hybrid double-precision format with an extended range of exponents. On BSD systems such as FreeBSD, NetBSD and OpenBSD, the hardware double-precision roundi