c program for regula falsi method for root finding

#include<stdio.h>
#include<math.h>
//#include<process.h>
float f(double x)
{
return ((x*x*x)-2*x-5);
}
void main()
{
float a,b,c,h;
printf("\n Enter the lower limit a and upper limit b\n");
scanf("%f%f",&a,&b);
if(f(a)*f(b)>0.0)
printf("\n Enter the proper values\n");
do
{
c=b-((b-a)*f(b))/(f(b)-f(a));
if(f(a)*f(c) <0.0)
b=c;
else
a=c;
h=b-((b-a)*f(b))/(f(b)-f(a));
}
while(fabs(h-c)>0.0001);
printf("\n The value of the root is =%f",h);
}

output

Enter the lower linit a and upper limit b

a=2
b=3
the value of the root is =2.0945