What is a program?
Sequences of instructions for a computer. are made up of The smallest element of a programming language which expresses an action to be carried out. that the programming language knows and understands.
Just as words are put together to form a sentence, a program puts one or more statements together to form an A single action that can be performed by a computer processor.. Each statement tells the computer to perform a specific task, and the instructions tell a computer what to do.
Statements
Different A language used by a programmer to write a piece of software. use different statements. A few of these are listed in this table:
| Statement | Purpose |
| Output a message on the screen | |
| input | Get data from the user |
| if…else | A decision |
| while | A loop controlled by a decision |
| for | A loop controlled by a counter |
| def | Create a procedure or function |
| Statement | |
|---|---|
| Purpose | Output a message on the screen |
| Statement | input |
|---|---|
| Purpose | Get data from the user |
| Statement | if…else |
|---|---|
| Purpose | A decision |
| Statement | while |
|---|---|
| Purpose | A loop controlled by a decision |
| Statement | for |
|---|---|
| Purpose | A loop controlled by a counter |
| Statement | def |
|---|---|
| Purpose | Create a procedure or function |
Examples
The following sentence asks someone to write a message on a whiteboard:
“Please write the words ‘Hello world!’ on the board.”
This sentence is an instruction, which contains a single statement. The statement is ‘write the words’. In A high-level programming language. (3.x), the equivalent statement is print.
print("Hello world!")The following Python (3.x) program contains two instructions, each built up from one statement:
if age >= 17
print("You are old enough to drive a car!")