Is there a more efficient way to clamp real numbers than using if statements or ternary operators?
I want to do this both for doubles and for a 32-bit fixpoint implementation (16.16). ... |
I have output like this:
1569.3669
15968.3699
41.3878
587.5401
but I want the output like this:
01569.3669
15968.3699
00041.3878
00587.5401
How can I do this in the C language?
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Hi I'm trying to convert from an int to a float in C and for some reason the cast changes the value and I'm not sure why. So:
fprintf (stderr, "%d,%d\n", rgbValues->green, ...
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#include<stdio.h>
int main()
{
float a=5;
printf("%d",a);
return 0;
}
This gives the output:
0
Why is the output zero?
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I wrote a function named absD that i want to return the absolute value of its argument..
I am using GCC inline assembly with cygwin..
I dont see why its not working. i ... |
I am working on an embedded application and need to print floating point values. Due to space and other limitations I can only use putchar() for output.
I am trying to ... |
I need to find maximum and minimum of 8 float values I get. I did as follows. But float comparisons are going awry as warned by any good C book!
How do ... |
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The end result of my program yields the following values in two double variables declared as e1 and energy:
e1 = 278872475.434922
energy = 2982053.000000
my final result is per=e1 divided by energy.The actual ... |
I would rather not dump code, but explain my problem. After hours of debugging I managed to understand that at some point in my code, a float value that is not ... |
I am wondering what the difference is between these two variables in C:
float price = 3.00;
and
float price = 3.00f;
The trailing "f"? Thanks.
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I have this problem:
I have created a structure using the itimerspec structure. The itimerspec structure has two fields:
struct timespec {
...
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I'm writing a JSON library for C (see https://github.com/DanielWaterworth/Butterfly ). I can serialize every other data type, but floating-points have stumped me. I need to write 2 functions:
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I'm using EmacsForMacOsX, v23.3.1, and I wonder how I can change the color for floating point values celsiusFloat = (5.0/9.0); to be a different color than those I get from my ... |
Today I was tracking down why my program was getting some unexpected checksum-mismatch errors, in some code that I wrote that serializes and deserializes IEEE-754 floating-point values, in a format that ... |
I'm using GCC to compile a program which adds floats, longs, ints and chars. When it runs, the result is bad. The following program unexpectedly prints the value of 34032.101562.
Recompiling ... |
I have some C code performing high precision arithmetic compiled by gcc(gcc (GCC) 4.4.4 20100726 (Red Hat 4.4.4-13)).The final result of the calculation is a double which has a value of ... |
When I use % operator on float values I get error stating that "invalid operands to binary % (have ‘float’ and ‘double’)".I want to enter the integers value only but the ... |
I want to compare float values to determine the biggest number in the list.The precision of the float is fixed, 6 after the decimal.
Should I just compare them as integer and ... |
I have just noticed something weird in my code
I have created simple app to show you what I'm talking about
float Test1 = 112.12;
float Test2 = 0.12;
printf("Test1 %15f", Test1);
printf("Test1 %15f", Test1);
I have ... |
Possible Duplicate:
strange output in comparision of float with float literal
Here is the code
#include<stdio.h>
int main()
{
float a=0.3;
if(a==0.3)
printf("Hello World!");
else
printf("Stack Overflow");
...
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Let's say I have two doubles: double a, b; a = 9.35678910034592 b = 9.35678925602334 Obviously, a < b but lets say I just want to check up to 6 places after the decimal. I want to check if the condition a >= b is satisfied. I have a tolerance value: #define EPSILON 0.000001 Is this a good way to check ... |
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neha_chhatre@yahoo.co.in wrote: actually i want to check wether two float values are equal or not equal i.e suppose t and t1 are two float values and i want to check wether t and t1 are equal or not > please send in syntax form as in code form > please tell me how to do, Please quote relevant parts of the ... |
This C program: #include #include int main() { float value; for(value = -1.0f; 1.1f value; value += 0.1f){ printf("%.1f\n", value); } return 0; } Produces this output: -1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Trying to write an equivalent C++ program using ostream has proven ... |
Hi, I saw a line of codes in the "Fast Inverse Square Root" like this: Float InvSqrt(float x) { ....... int i = *(int *) &x; //get bits for floating value ..... x = * (float *) &i; //convert bit back to float If x =1, &x = 0x0013fe54 and *(int *) &x = 1065353216. Can anyone help me why I ... |
Hi, I worte a RPC program for client and server, After computing (which i already did)..i get a float value.Now i want this value to be sent to the client .I know how to do with integer (By passing the addreess using the pointers,but when i am doing the same here iam getting errors.Can any 1 tell how to do that ... |
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I'm making a calculator that is Supposed to calculate floating point values, but somethign goes wrong along the way (can't be sure what). It calculates intagers just fine, but when I add a decimal with an extra intager on, something funky happens. It infinitly displays a rounded number. For instance, if I type in "3+1.3", instead of displaying "4.3" once like ... |
This is a perfectly reasonable thing to do. In fact to test my own megafloat class that implemented 128-bit or greater floats, to confirm that the value returned as being its minimum is correct, I essentially compare it against the result of repeated multiplication by 0.5 until just before it becomes zero. MK27: It must be 0.5f though that you multiply ... |
//code to convert string(containing digits) to equivalent float value //Its giving approx value but not exact value #include #include #include int main() { char a[20]; int c,i=0,k,sign=1; float f=0; while((c=getchar())!='\n' && i<19) { a[i]=c; i++; } a[i]='\0'; for(i=0;a[i]==' ' && i<19;i++) ; if( (a[i]=='+' && (sign=1)) || (a[i]=='-' && (sign=-1)) ) i++; for(;a[i]!='\0'&&a[i]!='.';i++) { f=f*10+(a[i]-'0'); } if(a[i]=='.') for(k=-1,i++;a[i]!='\0';i++,k--) f=f+pow(10,k)*(a[i]-'0'); f*=sign; printf("\n ... |
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34. Float Values cboard.cprogramming.com |
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Hello All, I'm having trouble getting this code to work. Basically, I have been given a '.txt' file with two columns of extensive float values. We have been asked to write a program that will separate the columns into two arrays in order to perform various calculations on them later. I have tried to create a while loop that runs through ... |
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I have several functions that return floating point values. I am currently exploring unit test suites and would like to write up some pretty extensive tests. My question is - what's the best way to test floating point values? A difficulty with floating point numbers is that if I perform the same calculation in a different order I may get a ... |
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42. float value cboard.cprogramming.com |
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When you involve integral types (eg, char, int, long) in division, the result is truncuated: the digits to the right of the decimal place are simply discarded. 3/2 results in 1. Floating point division (float, double, and long double) saves the decimal part of the number. Due to promotion, if there is a floating point number in an expression, the other ... |
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i'm using a structure that consists of eight different identifiers. 4 strings,1 float,1 long and 2 ints. the structure is stored in a binary file and i'm using fread to access it. i can check to see what is being read and stored using the watch and everything appears to be fine. but when i try to use printf or fprintf ... |
52. Float value cboard.cprogramming.com |
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Refer to the Wikipedia article on IEEE 754-1985 (http://en.wikipedia.org/wiki/IEEE_754-1985 -- there's a newer standard out now, but that page mostly deals with the new features while this page provides more details). It will show you the bit patterns within a floating-point number (both for 32-bit floats and 64-bit doubles). The point is that not all bit patterns are valid. Some produce ... |
I am using Microsoft Visual C++ 2005 Express Edition, and recently started to upgrade some old code that involves many mathematical computations. To access machine constants (for example, DBL_EPSILON), I previously included the header file . I am now wondering if this is still the proper way to account for computational round-off errors, or if a new approach is now available ... |
Is there an easy (and not too calculating-intense) way how to find the absolute difference between two floating values and check whether it's higher than a certain threshold or not. It's clear that you could do it with a couple of IF-Statements, but this wouldn't really be efficient since I've got arrays with many thousands of values. Any hint (with pointers?) ... |
I have some knowledge of C++ but I'm now learning the C language. Problem is I haven't been using C++ for a while until now. I have like C/C++ for the open source code so I went back to learning the basic to master the programming language before I can start working on the open source codes. So, here's the code ... |
Hi, I have to do multiplication on floating point values. But in my application, i cant do direct multiplication. So i wish to use the binary process, where by operating on two binary numbers, you can actually multiply them by addition. So i need a way to convert floating point numbers to binary numbers and work on these binary numbers. If ... |
I take it you're converting it to text then converting the text back to a float? The difference in value may only be visible with a precision greater than the number of zeroes you're showing. A float yields a large range at the expense of precision. It is, after all (in a typical, common system), 32 bits, as is an integer. ... |
Hello all. Would you guys help a poor and tired student with an idea or point him to the right dirrection? int main(int argc, char *argv[]) i do c++ in LINUX. i have a comand line which looks like this myprog -a[0.2] -b[0.04] .... I need to extract values in between brackets and saved them into the coresponding float variables. I ... |
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It's quite easy actually. The key is, when you exceed the maximum of a data type SOMETHING is going to go haywire. When you exceed a positive integer, it might go negative (or do something else). A simple while loop (or for loop) will get you "close". Just keeping multiplying a test number of that data type, by 2. When you ... |
Hi, first of all: the answer to my question is NOT atof()! I have a char-array that may contain something like "1.2345". I want to convert the contained values to float/doubles but unfortunately atof() depends on the current locale. So whenever a user executes the application on a system where "," is the decimal separator my result is 1.0, only on ... |
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#include #include #include int mygetd(double *result) { char *end, buff [ 32 ]; return fgets(buff, sizeof buff, stdin) && !isspace(*buff) && (*result = strtod(buff, &end)), ( *end == '\n' || *end == '\0' ); } int main(void) { double value = -12.3; do { fputs("Enter a floating-point number: ", stdout); fflush(stdout); } while ( !mygetd(&value) ); printf("value = ... |
#include #include int mygetd(double *result) { char c, buff [ 32 ]; return fgets(buff, sizeof buff, stdin) && !isspace(*buff) && sscanf(buff, "%lf%c", result, &c) == 2 && (c == '\n' || c == '\0'); } int main(void) { double value; do { fputs("Enter a floating-point number: ", stdout); fflush(stdout); } while ( !mygetd(&value) ); printf("value = %g\n", value); return ... |
#include int mygetd(double *result) { char buff [ 32 ]; /* modify array size to suit your needs */ return fgets(buff, sizeof buff, stdin) && sscanf(buff, "%lf", result) == 1; } int main(void) { double value; do { fputs("Enter a floating-point number: ", stdout); fflush(stdout); } while ( !mygetd(&value) ); printf("value = %g\n", value); return 0; } /* my output ... |