squareroot.c

#include <stdio.h>

int main(void)
{
    /* ---------Declerations--------- */
    float num; //number to find square root of
    double root; //the result of the calculation
    double max = 1000; //The highest guess
    double min = 0; //The lowest guess
    int imaginary = 0; // 0 for real, 1 for imaginary

    /*---------Input---------*/

    printf("What number would you like to find the square root of? ");
    scanf("%f", num);

    /*---------Calculations---------*/

    if(num<0)
    {
        imaginary = 1;
        num = -num;
    }
    if(num>1)
    {
        max = num; //Highest possible root of a counting number
    }
    else
    {
        max = 1;
    }
    while (max-min > num/1000000000000000)
    {
        root = (max+min)/2;
        if(root*root > num)
        {
            max = root;
        }
        else if(root*root < num)
        {
            min = root;
        }
        else if(root*root == num)
        {
            max=min;
        }
        else
        {
            printf("An error has occured, please contact developer.");
            return 0;
        }
    }

    /*---------Output---------*/

    printf("The square root of %lf is %lf", num, root);
    if(imaginary==1)
    {
        printf("i/n");
    }
    else
    {
        printf("/n");
    }
    return 0;
}