## some math problems in C

 programming some math problems in C
some math problems in C

I want to calculate secant method using C language
That is a program---->
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
main()
{
double fx(double x);
double x0,x1,x2,f0,f1,f2,err;
int n,i;
printf("\n\n f(x) =x*x*x-5*x-7");
printf("\n\nEnter an interval [x0,x1] in"
" which root is to be found");
printf("\nx0 =");
scanf("%f",&x0); /* INTERVAL[x0,x1] is to be entered here */
printf("x1=");
scanf("%f",&x1);
printf("\n Enter the number of iterations=");
scanf("%d",&n);
printf("\npress any key for display of iterations...\n");
getchar();
i=0;
while (n > 0)
{
f0=fx(x0);
f1=fx(x1);
x2 = x1-((x1-x0)/(f1-f0))*f1;
i++;
printf("\n x[%d]=%f x[%d]=%f",i,i-1,x0,i,x1);
printf("\n f[%d]=%f f[%d]=%f",i,i-1,f0,i,f1);
printf("\n x[%d]=%f",i+1,x2);
x0=x1;
x1=x2;
getchar();
}
printf("\n\nThe value of root is =%f",x2);
}
double fx(double x)
{
double f;
f=x*x*x-5*x-7;
return(f);
}

But while running not the erreo is displayed but the results displayed is
f(x) =x*x*x-5*x-7

Enter an interval [x0,x1] in which root is to be found
x0 =2.5
x1=3

Enter the number of iterations=4

press any key for display of iterations...

x=0.000000 x=0.000000
f=-7.000000 f=-7.000000
x=inf

Means not able to calculate root as seen in the output it is x=0...

so what will be the problem????
 cdfd123 View Public Profile for cdfd123 Find all posts by cdfd123
do you relly think you have a math-problem if you input 2.5 for x0 and you get 0 if you output x0? if x0=0 and x1=0 the function values at these points is 7 , so the math seems to be ok. to track down the bug it will be useful do reduce your program to one which inputs x0 and outputs x0 and analyze this code further.
mfgn guenter
 guenter View Public Profile for guenter Find all posts by guenter
Quote:
Originally Posted by guenter
do you relly think you have a math-problem if you input 2.5 for x0 and you get 0 if you output x0? if x0=0 and x1=0 the function values at these points is 7 , so the math seems to be ok. to track down the bug it will be useful do reduce your program to one which inputs x0 and outputs x0 and analyze this code further.
mfgn guenter
Yah Math seems to be ok!!!
so u might know the easiet problem to solve it
Though i don't like to excuse just i am new to C and do some biological problem..
that simple things goes after me ha...
hope u can solve it!!!. cdfd123 View Public Profile for cdfd123 Find all posts by cdfd123
hi
if you want to scan for or print a double the correct format is %lf not %f
i also think the construct
will not be very useful
mfg g�nter
 guenter View Public Profile for guenter Find all posts by guenter
These:
printf("\n x[%d]=%f x[%d]=%f",i,i-1,x0,i,x1);
printf("\n f[%d]=%f f[%d]=%f",i,i-1,f0,i,f1);
need a little work as well. Perderabo View Public Profile for Perderabo Find all posts by Perderabo

Test Your Knowledge in Computers #276
Difficulty: Easy
OpenSolaris was based on Solaris, which was originally released by Sun in 1999.
True or False?

## 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...

## 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

## Math function with C

I have int miles, yards; float kilometers; float kilometers2; miles = 26; yards = 385; kilometers = 1.609 * (miles + yards / 1760.0); where int/float remains a float. How ever if I change it to kilometers = 1.609 * (miles + yards / 1760); ...

## 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...

## 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?

## 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?

## 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...

## math.h not working? o.0

Alright, umm i cant get this to work. im looking at some example and a book i have. when i try to compile my program i get an error message. ld: 0711-317 ERROR: Undefined symbol: .sqrt ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information. I did #include<math.h> after my...