What Is Algorithm In C Programming: A Complete Guide

An algorithm is a step-by-step method describing steps that must be taken to get the desired result. Most algorithms are made without regard to the language they are written in. This means an algorithm can be written in multiple programming languages. 

Some of the things that make up an algorithm are that it is clear, precise, effective, and independent of language. The most important things about an algorithm are how well it works and how easily it can be used.

How Do You Define an Algorithm in C?

In C programming, an algorithm is just a set of instructions for how to solve a certain problem. An algorithm is a clear set of instructions for carrying out a detailed computation or set of operations.

As seen through the lens of data structures, the following groups of algorithms are particularly noteworthy:

  • Search Algorithm for looking up a value in a database.
  • Sort is an algorithm for arranging data into a specific hierarchy.
  • Insert Insertion algorithm for various data structures.
  • The update algorithm modifies data in a preexisting data structure.
  • Deletion algorithm in a data structure.

Algorithm in C Example

Take this as an example of how to add three numbers and output the sum.

Step 1: Make sure you have everything you need

As we’ve seen, the requirements for an algorithm’s creation must be met before the algorithm can be written.

This algorithm is meant to address the challenge: Display the sum of three numbers that have been added together.

What can’t be changed about the situation and must be taken into account in finding a solution: There can be no letters or other symbols in the numbers.

The information needed to address the issue is the sum of three digits.

The expected result of using a solution is the sum of the three numbers that were given, written as a single “+” integer.

The optimal solution to this problem under the existing conditions is: Summing the three 

numbers, which gives us the answer. The “+” operator, bitwise operations, or another approach may be used.

Step 2: Designing the algorithm

With these prerequisites in mind, let’s start designing the algorithm:

Here’s an algorithm to add up three numbers and display the result:


Let’s start by naming some variables num1, num2, and num3 as integers.

Put the three numbers that need to be added into the num1, num2, and num3 variables.

Make a new variable called sum that will hold the total of the three integers.

Put the sum of the three numbers into the sum variable.

Show the sum of the variable END on the screen.

Step 3: Put the method into practice for testing.

Let’s make a C program of the algorithm and see if it works.

// C program to add three numbers

// with the help of the above-designed algorithm

#include <stdio.h>

int main()


// Variables to take the input of the 3 numbers

int num1, num2, num3;

// Variable to store the resultant sum

int sum;

// Take the 3 numbers as input

printf(“Enter the 1st number: “);

scanf(“%d”, &num1);

printf(“%d\n”, num1);

printf(“Enter the 2nd number: “);

scanf(“%d”, &num2);

printf(“%d\n”, num2);

printf(“Enter the 3rd number: “);

scanf(“%d”, &num3);

printf(“%d\n”, num3);

// Calculate the sum using + operator

// and store it in a variable sum

sum = num1 + num2 + num3;

// Print the sum

printf(“\nSum of the 3 numbers is: %d”, sum);

return 0;



Enter the 1st number: 0

Enter the 2nd number: 0

Enter the 3rd number: -1577141152

The sum of the 3 numbers is: -1577141152

The Benefits of Algorithm in C Programming

Algorithm in C

Let’s take a look at why they’re so helpful in C.

  • It explains how to solve a problem in a logical, step-by-step fashion.
  • As it doesn’t rely on any programming language, anyone can pick it up and use it.
  • Debugging is a breeze.
  • It follows a set protocol.
  • It’s simpler to put into action.

Also Read: TypeScript: Boosting Your Productivity and Code Quality

Challenges with Algorithm in C Programming

Let’s look at a few disadvantages of algorithms in C programming:

  • Processing algorithms take a long time.
  • Programming complex procedures is a challenge.
  • It takes work to visualize algorithms with loops and branches.
  • Making sense of algorithms that use complicated logic can be exceedingly challenging.

What is the necessity for algorithms?

1. Algorithms are crucial for effectively and efficiently resolving complicated issues.

2. They contribute to the automation of procedures, making them more efficient, rapid, and straightforward.

3. Algorithms also allow computers to carry out activities that would be challenging or impossible for people to undertake manually.

4. They are used in math, computer science, engineering, finance, and many other fields to improve workflows, look at data, predict outcomes, and solve problems.

Properties of Algorithm:

  • It should finish after a specified time.
  • It should produce at least one output.
  • It should take zero or more input.
  • It should be deterministic, which implies delivering the same output for the same input.
  • Every step in the algorithm must be practical, i.e.. every effort should accomplish some work.

What are the characteristics of algorithms in C programming?

  • Specific processes and methods lack certain qualities that make them suitable for classification as algorithms.
  • Data Provided to the Algorithm: Well-Defined Inputs or Zero
  • The output of an algorithm must be adequately specified, or it must correspond to the expected outcome.
  • To be practicable, it must use the resources well and be efficient.
  • All the steps in an algorithm must be completely transparent, and they must all carry the same meaning.
  • Programming language agnostic; the steps involved should be the same for any given program.

How To Write Algorithm In C For Loop


Step 1: Start.

Step 2: Initialize variables.

Step 3: Check FOR condition.

Step 4: If the condition is proper, then go to Step 8; otherwise, go to Step 7.

Step 5: f = f * i.

Step 6: Go to Step 3.

Step 7: Print the value of the factorial.

Step 8: Stop.


#include <stdio.h>

#include <conio.h>

void main()


    int i, a,f = 1;

    printf(“Enter a number:\n”);

    scanf(“%d”, &a);

    for (i = 1; i <= a; i++)

        f = f * i ;

    printf(“Factorial of %d is %d\n”, a, f);




Enter a number: 6

The factorial of 6 is 720.

The for loop is very important in the C programming language and will be used a lot, so you should learn it well.


In C, the word “algorithm” refers to using instructions already set up to finish a task or solve a problem. Creating and running efficient algorithms in C is essential if you want to get the best performance and solve complex problems.

To improve performance, you need to make C algorithms that work well. This is especially important when you have limited resources.

When writing algorithms in C, you must follow good coding standards, such as naming variables correctly, adding comments, and putting your code in a way that makes sense.

To ensure C algorithms work well and correctly, you must test them and fix any bugs you find.

There are many ways to write C algorithms, such as recursion, dynamic programming, and greedy algorithms. To learn more, visit educationnest.com right away!

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