Programming Example

Calculate Square Root without using Math.h sqrt Function

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💻 Practical Program

📘 Step by Step Learning

Write a C program which will calculate the square root of a number without using math.h sqrt() function and print that sqrt to the STDOUT as floating point number with exactly 2 decimal precision.

Program Code

#include<stdio.h>
#include<stdlib.h>

int main(int argc, char *argv[])
{
    if(argc==1)
    {
        printf("No arguments");
     return 0;
    }
    else
    {
        int n;
        n=atoi(argv[1]);
        float i=0.00;
        
        while(i*i<=n)
        {
            i=i+0.001;
        }
        
        i=i-0.001;
        printf("%.2f",i);
    }
}

Output

37

6.08

Explanation

Nope

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.