math.h error => C language Post: 302496912

Sponsored Content

Top Forums Programming math.h error => C language Post 302496912 by solaris_user on Tuesday 15th of February 2011 05:18:25 PM

02-15-2011

Registered User

math.h error => C language

I don't know how to implement sqrt() function in C languge.
Every time I call a compiler I get this error

Code:

function sqrt not declared

I looked at C standard libray reference and from my perspective everthing is O.K

Here is the code

// Program asks user to enter the sides of the triangle
// and then test if triangle is isoscelesm , right-angled, equilateral
// Solution for exercise 17 (chapter 5)
// Date of creation: 15/02/2011

Code:

#include <stdio.h> 
#include <math.h>

int main(void) {
    
    float a,b,c;
    
    // Asks user to enter sides
    
    printf("\t\tTriangle detection triangle\n");
    printf("Enter three sides of the triangle: ");
    scanf("%f, %f, %f", &a, &b, &c);
    
    if (a <= 0 || b <= 0 || c <= 0) {
        printf("Invalid input\n");
        return 1;
        }
    else if (a + b > c && a + c > b && b + c > a) {
        printf("Valid entry!\n");
        }
    if ( a != b && a != c && b != a && b != c && c != a) {
        printf("isoscelesm\n");
        }
    else if ( a == b && a == c ) { 
        printf("equilateral\n");
        }
    else if ( b == a && b == c ) {
        printf("equilateral\n");
        }
    else if ( c == a && c == b) {
        printf("equilateral\n");
        }
    else if (c == sqrt (a * a  + b * b)) {
        printf("equilateral\n");
        }
    
    return 0;
}

solaris_user

View Public Profile for solaris_user

Find all posts by solaris_user

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Math calculation help

Hi, I wrote this script awk -F"\t" '{if ((($1 == 586) || ($1 == 68030)) && (($2/1024) < 512)) print $0"\t"(512-($2/1024))"\t"(512-($2/1024))/256}' pcs.txt But I want from the calculation in red to get rid of the decimal part. Like instead of 1.75 to keep only 1.Please somebody tell me what...

2. Programming

something about <math.h>

Hi, I got an easy problem for you but really difficult for me 'cause I am pretty new to this field I got header file <math.h> included in my .c file , then I write the code as below: k = sqrt(i); /* both variables k and i are int */ then I cc temp.c it says like this undefined...

3. Programming

math.h in makefile

Hey all, How do I link the math library in a gnu make makefile? I have tried using -lm with the CFLAGS varibale - flags like -Wall and -ggdb work, but -lm does not. I am running gcc - 4.1.2 on a linux machine.

4. UNIX for Dummies Questions & Answers

math in unix

I have 2 variables a=2 b=1 i want to add a and b how do i do this in unix using just the echo command and by assigning it to a different variable like c?

5. Shell Programming and Scripting

math help

$ x=1 $ y=1.5 $ z=$((x*y)) bash: 1.5: syntax error: invalid arithmetic operator (error token is ".5") What's wrong?

6. Shell Programming and Scripting

Need help with AWK math

I am trying to do some math, so that I can compare the average of six numbers to a variable. Here is what it looks like (note that when I divide really big numbers, it isn't a real number): $ tail -n 6 named.stats | awk -F\, '{print$1}' 1141804 1140566 1139429 1134210 1084682 895045...

7. UNIX for Dummies Questions & Answers

Linux Math Help

I am struggling with scripting this challenge a friend and I have. You have file1 and its contents is a single number you have file 2 and its contents are a different number you want to add file1 to file2 and have the output be put into file3

8. UNIX for Dummies Questions & Answers

Math

i have file (my_file.txt) that looks like this: 000000000000010000 000000000000010000 000000000000005000 000000000000005000 000000000000005000 000000000000005000 000000000000005000 000000000000005000 000000000000005000 000000000000005000 all said and one, it should look...

9. UNIX for Advanced & Expert Users

Gcc g++ on cygwin - configure: error: *** A compiler with support for C++11 language features is req

Hi, Apologies if I posted it in a wrong section as it is related to gcc on cygwin. Please move it to appropriate section. I'm trying to compile and build libsigc++-2.10.2 on cygwin with gcc 8.3.0. when I run ./configure, I get this: I couldn't fully understand what does...

LEARN ABOUT REDHAT

sdl_joystickopen

SDL_JoystickOpen(3)						 SDL API Reference					       SDL_JoystickOpen(3)

NAME

       SDL_JoystickOpen- Opens a joystick for use.

SYNOPSIS

       #include "SDL.h"

       SDL_Joystick *SDL_JoystickOpen(int index);

DESCRIPTION

       Opens a joystick for use within SDL. The index refers to the N'th joystick in the system. A joystick must be opened before it game be used.

RETURN VALUE

       Returns a SDL_Joystick structure on success. NULL on failure.

EXAMPLES

       SDL_Joystick *joy;
       // Check for joystick
       if(SDL_NumJoysticks()>0){
	 // Open joystick
	 joy=SDL_JoystickOpen(0);

	 if(joy)
	 {
	   printf("Opened Joystick 0
       ");
	   printf("Name: %s
       ", SDL_JoystickName(0));
	   printf("Number of Axes: %d
       ", SDL_JoystickNumAxes(joy));
	   printf("Number of Buttons: %d
       ", SDL_JoystickNumButtons(joy));
	   printf("Number of Balls: %d
       ", SDL_JoystickNumBalls(joy));
	 }
	 else
	   printf("Couldn't open Joystick 0
       ");

	 // Close if opened
	 if(SDL_JoystickOpened(0))
	   SDL_JoystickClose(joy);
       }

SEE ALSO

       SDL_JoystickClose

SDL
							      Tue 11 Sep 2001, 23:00					       SDL_JoystickOpen(3)