1. ## bisection method

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...

Code:
```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 = (x1 + x2) / 2;
series = a * x * x + b * x + c;
d = fabs(series);

if (d > 0.0001)
{
if (x * x1 < 0)
x = x2;
else
x = x1;

}
else
{
printf("ans=%f", x);
}

return 0;
}```

it should be

int main(void)

you should work on your indentation

goto read; - there are several cases where usage of goto has its reasons. Your case is not one of these. So write your code using while loop

3. hey thnx vart.....!!!

4. hey i edited it ....bt its still not workin...help...

Code:
```#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;
}```

5. you have doe notinnk with the line
if(x*x1 < 0)

suppose x1 = 1, x2 = 3, than x = 2

think about right condition to get rid of the half of the interval