Floating Point Error In C Programming
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Floating Point Exception 8 C
hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join floating point exception (core dumped) in c the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C programming - floating floating point exception in c++ point exception up vote 2 down vote favorite 1 matthewmpp@annrogers:~/Programming/C.progs/Personal$ cat prime4.c /* * File: main.c * Author: matthewmpp * * Created on November 7, 2010, 2:16 PM */ #include
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while (1) { printf("Please enter a whole number.\n"); fgets(line, sizeof (line), stdin); sscanf(line, "%d", &n_input); if (n_input >= 0) break; return (n_input); } } int ifstatements_func (n_ifstate) int n_ifstate; { if (n_ifstate == 0) { printf("The number, %d, is not prime and has no factors.\n", n_ifstate); exit(1); } if (n_ifstate == 1) { printf("The number, %d, is not prime.\n", n_ifstate); printf("The factors of %d, is %d.\n", n_ifstate, n_ifstate); exit(1); } if (n_ifstate == 2) { printf("The number, %d, is a prime.\n", n_ifstate); printf("The factors of %d, are 1 and %d.\n", n_ifstate, n_ifstate); exit(1); } if (n_ifstate == 3) { printf("The number, %d, is a prime.\n", n_ifstate); printf("The factors of %d, are 1 and %d.\n", n_ifstate, n_ifstate); exit(1); } return (n_ifstate); } int square_root_func (n_prmfnc) int n_prmfnc; { int i; //counter float sq_root_f; int sq_root_i; int primes[100]; int length_primes; primes[0] = 2; /*first prime is 2.*/ primes[1] = 3; /*second prime is 3.*/ length_primes = sizeof (primes); //printf ("before.sq_root.value of n_prmfnc=%d\n", n_prmfnc); sq_root_f = sqrt(n_prmfnc); sq_root_i = sq_root_f; //printf ("prmfnc.after.sq_root\n"); //printf ("value of sq_root=%.3f\n", sq_root_f); //printf ("value of sq_root=%d\n", sq_root_i); return (sq_root_i); } int prime_func (sq_root_pf, n_pf) int sq_root_pf, n_pf; { int prime_counter; int p
be other bugs as well. These will most likely not be fixed. You may be able to find more up-to-date versions of some floating point exception in c programing of these notes at http://www.cs.yale.edu/homes/aspnes/#classes. Real numbers are represented in C by floating point exception 8 mac the floating point types float, double, and longdouble. Just as the integer types can't represent all integers because
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they fit in a bounded number of bytes, so also the floating-point types can't represent all real numbers. The difference is that the integer types can represent values within http://stackoverflow.com/questions/4122172/c-programming-floating-point-exception their range exactly, while floating-point types almost always give only an approximation to the correct value, albeit across a much larger range. The three floating point types differ in how much space they use (32, 64, or 80 bits on x86 CPUs; possibly different amounts on other machines), and thus how much precision they provide. Most math library http://www.cs.yale.edu/homes/aspnes/pinewiki/C(2f)FloatingPoint.html routines expect and return doubles (e.g., sin is declared as doublesin(double), but there are usually float versions as well (floatsinf(float)). 1. Floating point basics The core idea of floating-point representations (as opposed to fixed point representations as used by, say, ints), is that a number x is written as m*be where m is a mantissa or fractional part, b is a base, and e is an exponent. On modern computers the base is almost always 2, and for most floating-point representations the mantissa will be scaled to be between 1 and b. This is done by adjusting the exponent, e.g. 1 = 1*20 2 = 1*21 0.375 = 1.5*2-2 etc. The mantissa is usually represented in base b, as a binary fraction. So (in a very low-precision format), 1 would be 1.000*20, 2 would be 1.000*21, and 0.375 would be 1.100*2-2, where the first 1 after the decimal point counts as 1/2, the second as 1/4, etc. Note that for a properly-scaled (or normalized) floating-point number in base 2 the digit before the
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site http://programmers.stackexchange.com/questions/101163/what-causes-floating-point-rounding-errors About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Programmers Questions Tags Users Badges Unanswered Ask Question _ Programmers Stack Exchange is a question and answer site for professional programmers interested in conceptual questions about software development. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask floating point a question Anybody can answer The best answers are voted up and rise to the top What causes floating point rounding errors? up vote 40 down vote favorite 22 I am aware that floating point arithmetic has precision problems. I usually overcome them by switching to a fixed decimal representation of the number, or simply by neglecting the error. However, I do not know floating point exception what are the causes of this inaccuracy. Why are there so many rounding issues with float numbers? floating-point numeric-precision share|improve this question asked Aug 15 '11 at 13:07 nmat 318135 25 To be precise, it's not really the error caused by rounding that most people worry about -- it's the fact that binary floating-point rounding behaves in unintuitive ways. Switching to a decimal representation can make the rounding behave in a more intuitive way, but in exchange you will nearly always increase the relative error (or else have to increase the storage space to compensate). –Daniel Pryden Aug 15 '11 at 16:35 8 My attempt to clear up the most common confusions: floating-point-gui.de –Michael Borgwardt Aug 16 '11 at 11:22 i think what @DanielPryden means is "Switching to a [fixed-point] representation can make the rounding behave in a more intuitive way...". what causes rounding problems, whether it's fixed or floating-point numbers is the finite word width of either. it's just that, with floating-point, the magnitude of the rounding error normally remains roughly proportional to the magnitude of the number being rounded. (except when you get really sma