Difference between Function and Procedure | Function vs Procedure

By Aina Parasher|Updated : September 30th, 2022

The Difference between Function and Procedure is that the procedure is an important and often used programming construct. It's used to write good procedure calls and returns code. However, the function contains the set of programming statements enclosed by {}. It allows the program to reuse and modularize its code.

Difference between Function and Procedure PDF

Both function and procedure play an important role in the program's execution. We have provided a list of the difference between function and procedure and a brief introduction to function and procedure in the upcoming sections.

Difference between Function and Procedure

A function returns the returning value/control to the code or calling function. Here, we have provided the difference between function and procedure in the table below, which is an essential topic for the GATE CSE exam.

Key Differences between Function and Procedure

The function computes the outcome based on the inputs.The procedure completes tasks in a specific order.
A function is a tool for calculating something based on input. 

While a procedure is a collection of commands executed in a specific order.

A SELECT statement can include a function call. A SELECT statement does not include a procedure call.
The resultant value or control is returned to the calling function or code.It returns control to the code or calls the function but not a value.
DML commands like (Insert, Delete, and Update) are not allowed in a function.DML statements can be utilized in procedures.
We can call a function via the procedure. A procedure, on the other hand, cannot be called via a function.
It has to do with a particular expression.It is not required to deal with a facial expression.

Function and Procedure

The processes perform tasks in a specific order based on the specified inputs. On the other hand, a procedure would return the control to the calling function but not any value to the code. Over the years, various questions can be asked on both Function and Procedure in the GATE question paper. Let us understand each in detail.

What is a Function?

A function in a programming language is a sequence of instructions that take some input and do some duties. A function can be predefined or created by the user. A function in a C program can be called numerous times for reusability and modularity. 

A function is one of the most basic concepts in computer programming. It's used to compute anything based on a set of inputs. As a result, mathematics gave it its name. Functions can be user-defined or pre-defined. A block of code in the function program performs certain duties or functions.

What is a Procedure?

A procedure is defined as the sequence of commands that are executed. For a compiler, it is a crucial programming construct. For procedure calls and returns, the procedure generates good code. It isn't concerned with an expression. 

A procedure (sometimes known as a stored procedure) is a group of precompiled SQL statements saved in a database. It is a standard computing language subroutine or subprogram. A procedure must always have a name, a list of parameters, and SQL statements. It does not return a value in structured query language (or SQL). SQL is an important concept for the GATE exam. Both functions and procedures are referred to as subroutines in Java.

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FAQs on Difference between Function and Procedure

  • The basic difference between function and procedure is that the output of a procedure can be zero or multiple numbers whereas, the function does not contain any DML or DDL statements, it can be called with the select statement.

  • A function is a collection of instructions that receive input from users and perform certain tasks in computer programming languages. These functions then carry out their functions in the programme and return a value.

  • Procedures are a collection of instructions that receive input and are used to complete a task. After receiving the input, a procedure in SQL would not return any value. In the Java language, however, a function and a procedure have the same behaviour.

  • Based on their DML statements, the difference between function and procedure is that the DML statements cannot be used in a function while in a procedure, DML statements can be used.

  • In computer programming language, a procedure can not be called using a function whereas a function can be called using a procedure. This is one of the important distinguish factor of the difference between function and procedure.

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