Newton Raphson's Method C language program - To find Square Root

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

float f(float x,int n)
{
        return(x*x-n);
}

float df(float x)
{
        return 2*x;
}

void main()
{
        float b=5,m,e=0.0001,num;
        int i;
        clrscr();
        printf("\n Newton Raphson's Method : To find Square Root");

        printf("\n Enter Number whose Square root to be found :- \n");
        scanf("%f",&num);
        m=(b)-((f(b,num))/df(b));
        i=1;
        while(fabs(f(m,num))>e)
        {
                b=m;
                m=(b)-((f(b,num))/df(b));
                i=i+1;
                printf("\n Square root of %.2f is %.2f",num,m);
                getch();
        }
}


OUtput


 Newton Raphson's Method : To find Square Root
 Enter Number whose Square root to be found :-
7

 Square root of 7.00 is 2.69
 Square root of 7.00 is 2.65
 Square root of 7.00 is 2.65