Floating Point Error In Turbo C
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta floating point format not linked turbo c Discuss the workings and policies of this site About Us Learn more illegal use of floating point in c++ about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack float in structure in c Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping online c compiler each other. Join them; it only takes a minute: Sign up How to fix Illegal use of floating point error in C++ up vote -1 down vote favorite I am getting type mismatch and illegal use of floating point error in this C++ program in Turbo C++. Here I am trying to illustrate GO BACK n ARQ
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protocol but I am not getting why ws variable is involved with error. #include #include #include int ws,sf,ef,m; //Type mismatch error int i,ack[50]; char ch; void send(int sf){ for(i=sf;i<=(ws-1);i++){ cout<<"\n\n\nFrame "<>ch; if(ch=='y'){ ack[i]=1; cout<<"Acknowledgement recieved for frame "<>m; ws=pow(2,m)-1; //illegal floating point error sf=0; ef=sf+ws-1; send(0); while(check()) { for(i=0;ihere 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 About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join 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 Illegal use of Floating Point error while compiling up vote 0 down vote favorite I am getting an error as "illegal use of floating point" while running the program below. How should I fix it. #include #include int main() { float x,op; printf("enter the value of http://stackoverflow.com/questions/25808248/how-to-fix-illegal-use-of-floating-point-error-in-c x"); scanf("%f",&x); op=(x^1/2+x^2/3+x^3/4)/(x^5/2+x^7/2); printf("Final Op is %f\n",op); return 0; } c share|improve this question edited Jun 13 '15 at 3:13 Pang 5,221134574 asked Jun 6 '15 at 8:25 chandra mouli 11 Umm formatting fail:( –Martin James Jun 6 '15 at 8:26 formatting fail ? what does it mean? –chandra mouli Jun 6 '15 at 8:28 1 Also note that the 'uparrow' operator is not overloaded to mean 'raise to the power of' with floats - it's a bitwise XOR operator. –Martin James http://stackoverflow.com/questions/30680644/illegal-use-of-floating-point-error-while-compiling Jun 6 '15 at 8:29 Never mind - haccks has fixed it. –Martin James Jun 6 '15 at 8:31 Use pow() for exponentiation. –Paul R Jun 6 '15 at 8:32 | show 2 more comments 3 Answers 3 active oldest votes up vote 3 down vote In C, ^ is used as the bitwise XOR operator. Each of the operands shall have integer type. 6.5.11 Bitwise exclusive OR operator: 2 Each of the operands shall have integer type. 4 The result of the ^ operator is the bitwise exclusive OR of the operands [...] You need the standard library function powf: float powf(float x, float y); Include math.h header in your program. Also note that as pointed out by @Jens Gustedt 1/2, 2/3 and 3/4 will all return 0 because they are integer division. You need to change them to 1.0/2, 2.0/3 and 3.0/4. share|improve this answer edited Jun 6 '15 at 8:57 Paul R 148k16223367 answered Jun 6 '15 at 8:28 haccks 68k1788162 1 One could perhaps also mention that things like 1/2 are probably not what OP expects. –Jens Gustedt Jun 6 '15 at 8:41 Also note that powf is by no means universal, especially if OP is using an old compiler like Turbo C or MSVC (which is likely given the use of conio.h). –Paul R Jun 6 '15 at 8:42 @PaulR; Turbo C++ is obsolete and MSVC is not C compiler but visual C compiler. –haccks Jun 6 '15 at 8:46 @haccks:
Reasoning Interview HR Interview Group Discussion Placement Papers Technical Interview Engineering Mechanical Engineering Civil Engineering ECE EEE CSE Read more... Technical C Programming C++ C# Java Database Networking Read more... Medical Science Microbiology Biochemistry Biotechnology Biochemical Engineering Others http://www.indiabix.com/c-programming/floating-point-issues/discussion-136 General Knowledge Puzzles Quiz Sudoku Online Tests Ask your question? Close Menu C Programming http://cboard.cprogramming.com/c-programming/2869-borland-turbo-c-2-01-floating-point-error.html - Floating Point Issues - Discussion Home » Engineering » C Programming » Floating Point Issues » - Discussion Discussion :: Floating Point Issues - (Q.No.1)«« Floating Point Issues - General Questions«« Floating Point Issues - Find Output of Program 1. Point out the error in the following program. #include int main() { struct floating point emp { char name[20]; float sal; }; struct emp e[10]; int i; for(i=0; i<=9; i++) scanf("%s %f", e[i].name, &e[i].sal); return 0; } [A]. Suspicious pointer conversion[B]. Floating point formats not linked (Run time error)[C]. Cannot use scanf() for structures[D]. Strings cannot be nested inside structures Answer: Option B Explanation: Compile and Run the above program in Turbo C: C:\>myprogram.exe Sundar 2555.50 scanf : floating point formats not linked floating point error Abnormal program termination The program terminates abnormally at the time of entering the float value for e[i].sal. Solution: Just add the following function in your program. It will force the compiler to include required libraries for handling floating point linkages. static void force_fpf() /* A dummy function */ { float x, *y; /* Just declares two variables */ y = &x; /* Forces linkage of FP formats */ x = *y; /* Suppress warning message about x */ } Workspace Report errors ... Name : Email: Online C Compiler /* Note: GCC Compiler (32 Bit Linux Platform). */ #include int main() { printf("Weclome to IndiaBIX.com..!"); return 0; } C Compiler Workspace Report Naveen said: (Apr 22, 2011) can u pls explain it elaborately ??? Manohar said: (May 30, 2011) Can scanf() be used to read values for multiple variables ? Ashok said: (Jun 16, 2011) Ya scanf read the value. Badhri said: (Jun 27, 2011) @naveen : use a dummy variable initially to get input. Then substitute it to the structure float variable. Program : #include int main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; float dummy; for(i=0; i<=9; i++) scanf("%f",&dummy); e[i]
Programming Boards C Programming Borland Turbo C 2.01 Floating Point Error Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get a compiler | Fixes for common problems Thread: Borland Turbo C 2.01 Floating Point Error Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 10-10-2001 #1 Unregistered Guest Borland Turbo C 2.01 Floating Point Error Sorry if this message is in the wrong place, but I could not find a Turbo C group. The following program compiles with Borland Turbo C 2.01, but does not run properly: #include #include void main() { char cnum[] = "123.4"; float fnum; fnum = atof(cnum); printf("%f\n", fnum); } The error I get is: " scanf : floating point formats not linked Abnormal program termination" Has anyone experienced these problems before, if so can I change some settings within the compiler. Or does it mean using another compiler. I have downloaded the Borland BCC55 FreeCommandLineTools, but I am struggling to get it to compile my C programs (all the instructions/help seem to be for CPP programs). I have tried on two machines a) Pentium II 233MhZ (Laptop) and b) Intel Celeron 800 MHz (Desktop). Any help please. Steve s_v_murray@yahoo.co.uk 10-10-2001 #2 The V. View Profile View Forum Posts Registered User Join Date Sep 2001 Posts 412 You need to set the linker options to include floating-point support. Remember, math coprocessors didn't appear until the 386, I believe, and the Pentium was the first to have math coprocessors (for hardware support of floating-point math) in all machines. So, very old compilers didn't link floating point libraries by default -- if you need to use a float in an old compiler (or even in newer compilers that can produce true DOS programs), you must tell it you want floating point support. Quick Navigation C Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Programming Boards C++ Programming C Programming C# Prog