Difference between structured and unstructured programming
- Structured Programming is a type of programming that generally converts large or complex programs into more manageable and small pieces of code.
- These small pieces of codes are usually known as functions or modules or sub-programs of large complex programs.
- It is known as modular programming and minimizes the chances of function affecting another.
Below is the program to illustrate the structured programming:
C
// C program to demonstrate the // structured programming #include <stdio.h> // Function for addition int sum( int a, int b) { return a + b; } // Function for Subtraction int sub( int a, int b) { return a - b; } // Driver Code int main() { // Variable initialisation int a = 10, b = 5; int add, minus; // Function Call add = sum(a, b); minus = sub(a, b); printf ( "Addition = %d\n" , add); printf ( "Subtraction = %d\n" , minus); return 0; } |
Output:
Addition = 15 Subtraction = 5
Unstructured Programming:
- Unstructured Programming is a type of programming that generally executes in sequential order i.e., these programs just not jumped from any line of code and each line gets executed sequentially.
- It is also known as non-structured programming that is capable of creating turning-complete algorithms.
Below is the program to illustrate the unstructured programming:
C
// C program to demonstrate the // unstructured programming #include <stdio.h> // Driver Code int main() { // Variable initialisation int a = 10, b = 5; int add, minus; // Operations performed add = a + b; minus = a - b; printf ( "Addition = %d\n" , add); printf ( "Subtraction = %d\n" , minus); return 0; } |
Output:
Addition = 15 Subtraction = 5
Tabular difference between structured vs unstructured programming:
Structured Programming | Unstructured Programming |
---|---|
It is basically a subset of procedural programs. | It is basically a procedural program. |
In this, programmers are allowed to code a program simply by dividing the program into modules or smaller units. | In this, programmers are not allowed code divide programs into small units. Instead, the program should be written as a single continuous block without any breakage. |
It is more user-friendly and easy to understand as compared to unstructured programming. | It is less user-friendly and little hard to understand as compared to structured programming. |
It is easier to learn and follow. | It is difficult to learn and follow |
Its advantages include reduce complexity, facilitate debugging, increase programmer productivity programs, etc. | Its advantages include its speed. |
Such programs can be used for small and medium-scale projects and also for complex projects. | Such programs cannot be used for medium and complex projects. Instead, they can be used for small and easier projects. |
These programs do not allow code duplication. | These programs allow code duplication. |
Structured programs use a greater number of data types as compared to unstructured programs. | Unstructured programs use a limited number of data types as compared to structured programs. |
It does not use GOTO to control the flow of execution. Instead, it uses loops. | It uses GOTO to control the flow of execution. |
It produces readable code. | It hardly produces readable code. |
It does not provide full freedom to programmers to program as they want. | It provides full freedom to programmers to program as they want. |