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4 Flowcharts and

Algorithms

Let’s surf

Algorithm Characteristics of a Good Algorithm
Uses of an Algorithm Writing an Algorithm
Defining Flowcharts

Let’s PLug-in Critical Thinking

Look at the code and decode the message.
Code :
A-1 , B-2, C-3, D-4, E-5, F-6, G-7, H-8, I-9, J- 10, K-11, L-12, M-13, N-14, O-15, P-16, Q-17, R-18, S-19, T-20,
U-21, V-22, W-23, X-24,Y-25, Z-26, Space-27.

Message:
1 12 5 18 20 27 13 1 10 15 18 27 3 25 3 12 15 14 5 27

All humans communicate with each other using a language that has many words and tones.
Computers communicate and understand only '1' and '0'. We give instructions to the computer in our
language but it first converts it into 0 and 1 and then works according to our instructions. Let's learn
more about all this.

In our daily life, we have to solve various problems by using different strategies. These strategies are
called problem solving techniques. A problem solving technique is a collection of sequential steps to
solve a problem. In the same way, programmers also use different types of techniques to solve the
problems related to programming. Some of these techniques are algorithms and flowcharts. In this
chapter, we will learn about algorithms and flowcharts used to develop programs.

ALGORITHM

As we know that a program is a collection of instructions. The language used to write a program is
called a programming language. Before writing a program on the computer, every programmer must
analyse the problem and write an algorithm to solve the problem.

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