When we use the ";" at the end of a command line and when we do not use it

When we use the ";" at the end of a command line and when we do not use it

Answer 1

[M]

From https://www.tutorialspoint.com/matlab/matlab_syntax.htm :

Semicolon (;) indicates end of statement. However, if you want to suppress and hide the MATLAB output for an expression, add a semicolon after the expression.