Program to find square root

C Program to find square root of a number:

By Ahmad Irshad | Programming Exercises and Solutions > find square root of a number

Write a C program to find square root of a given number using sqrt() funciton (This function is used to find square root of a given number). Now let's see, how  to use this sqrt() funciton in programming.

Required knowledge for this exercise is: 

Basic Input output, Data Type

Before writing any program you just imagine about output screen first. For example: what input to be given, and output to be displayed. Let's have a look at the below example: 

INPUT:

Enter any number to find square root: 625

OUTPUT:

Square root of 625.00 is = 25.00

Logic to find square root of a given number:

Step by step logic to find square root of a given number.

1) Print a massage to the user like "Enter any number to find square root:"  using printf();

2) Input a number using scanf(); and store it in a variable num.

3) Now calculate square root using built-in function sqrt();

4) At last print the result of square root. that's it!

Program to calculate square root of a given number using sqrt() function: 

1. /* C program to find square root of a given number */ #include <stdio.h> #include <math.h>
2. int main() { double num, sroot; /* * Input a number from user */
3. printf("Enter any number to find square root: "); scanf("%lf", &num); /* * Calculate square of a given number */ sroot = sqrt(num);
4. /* * Print the result of sqaure root */ printf("Square root of %.2lf is = %.2lf", num, sroot); return 0; }

Output:

1. Enter any number to find square root: 625

1. Square root of 625.00 is = 25.00

Note: We use header file #include <math.h> since, it contains the declaration of sqrt() function. Visit to more about function and what is header file.

In above example, statements scanf("%lf", &num); format specifier %lf is used for double data type. 

And statements, printf("Square root of %.2lf is = %.2lf", num, sroot); %.2lf is used to print the number in decimal format upto 2 digits after dot. For Example: 625.00, 25.00 etc. 

Visit to know more about Format specifier.

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