Algorithm Vs Program

Algorithm –

An algorithm is a set of finite, step-by-step rules or instructions to convert inputs to outputs. It is simple and effective.

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Program –

A computer program is a collection of instructions that perform a specific task when executed by a computer. It follows the syntax of the programming language.

But my point is not about defining the word. My point is to tell you what an algorithm can do but a program cannot, or what a program can do but an algorithm cannot.

Example: To solve a problem, you need to design an algorithm and then implement it in the source code of any language. However, some problems can be solved by designing an algorithm; no programming language can solve them.

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I will give you an example. Write a program to compute the square root of any number.

You can make an algorithm of square root but you cannot make a program that will give the square root of every input. In an algorithm, you just have to pass the logic. This is so simple, but in a program that is syntactically and semantically correct, you cannot generate the output of every integer.

4 is 2 okay, 9 is 3 okay, and 16 is 4 okay, but what about 5, 6, 7, and 8? 4, 9, 16, 25… These are perfect square roots, but the square root of non-perfect square roots cannot be generated exactly.

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Example

There are some assumptions that square root 2 is equal to 1.414, and Hippasus, who was a Greek philosopher, discovered that the square root of 2 is an irrational number; that is, he proved that the square root of 2 cannot be expressed as a ratio of two whole numbers. You find out for yourself whether 1.414 is the correct answer; add thousands more numbers next to it, and the answer will still not be perfect. So, a computer program cannot do justice to the square root problem because it needs exactness, but an algorithm can give the logic.

Another example is for those who have great faith in friendship: when you like someone and you want to befriend him or her, but you have not yet succeeded, many people ask their closest friend how to talk to their “target.” Then your closest friend gives you some tips, so understand what he says, you should take it as an algorithm, which will only give you a logic, but making this program is a difficult task. The program will be made only if you make friends with your target, but 50% of the coincidences will be such that he or she refuses. Then your program will not be made.