Why control flow directs program logic in MATLAB

Introduction

Control flow helps decide which parts of a program run and when, making the program smart and able to handle different situations.

When you want the program to choose between different actions based on conditions.

When you need to repeat tasks multiple times until a goal is reached.

When you want to skip some steps if certain rules are met.

When you want to organize your program to handle errors or special cases.

When you want to make your program respond differently to user input.

Syntax

MATLAB

if condition
    % code to run if condition is true
elseif another_condition
    % code to run if another_condition is true
else
    % code to run if none of the above conditions are true
end

for index = start_value:end_value
    % code to repeat
end

while condition
    % code to repeat while condition is true
end

Use if to check conditions and decide which code runs.

Use for and while loops to repeat code multiple times.

Examples

Checks if x is greater than 5 and shows a message accordingly.

MATLAB

x = 10;
if x > 5
    disp('x is greater than 5');
else
    disp('x is 5 or less');
end

Repeats the message three times with the loop number.

MATLAB

for i = 1:3
    disp(['Loop number: ' num2str(i)]);
end

Repeats the message while count is less than or equal to 3.

MATLAB

count = 1;
while count <= 3
    disp(['Count is ' num2str(count)]);
    count = count + 1;
end

Sample Program

This program checks the temperature and shows a message about the weather. Then it repeats a message for three days.

MATLAB

temperature = 30;

if temperature > 25
    disp('It is hot outside.');
elseif temperature > 15
    disp('The weather is warm.');
else
    disp('It is cold outside.');
end

for day = 1:3
    disp(['Day ' num2str(day) ': Checking weather...']);
end

Important Notes

Always close if and loops with end in MATLAB.

Indent your code inside control flow blocks to keep it clear and readable.

Conditions inside if statements must result in true or false.

Summary

Control flow lets your program make decisions and repeat tasks.

Use if, elseif, and else to choose actions.

Use for and while loops to repeat code.