here is the c program for arriving at a solution using bisection method.
The ouput is going infinte..pls help ....i think it has more of syntax errors than logical errors...

#include<stdio.h>
#include<math.h>
main()
{float a,b,c,x1,x2,x,series;
double d;
 
printf("enter a,b,c and x1(pos) & x2(neg)");
scanf("%f%f%f%f%f",&a,&b,&c,&x1,&x2);

x=0;
d=1;
 while(d>0.0001)
    {
      x=(x1+x2)/2;
      
     series=a*x*x+b*x+c;
      
     d=fabs(series);
      
         if(x*x1 < 0)
             x2=x;
         else
             x1=x;
    }
     
printf("ans=%f",x);
 
return 0;
}

 

You can't have any syntax errors if the compiler is producing an executable, so any errors you have must be logic errors.

Apparently you're trying to find roots of a quadratic equation by choosing x values that straddle the root you're trying to find.

One suggestion I would make is to do your input one value at a time instead of all five at once. Can you verify that a, b, c, x1, and x2 are being set appropriately? You can do that using a debugger, or if you don't have one available, you can put printf statements after your input line(s).

What are your input values for a, b, c, x1, and x2? If I knew these, I could tell what your program is doing.

Mark