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Basic C Programming Questions

Basic Coding Questions:Exercise 1:Q1. Write a programme to calculate area and perimeter of rectangle by accepting its length and breadth.
Ans:
#include<stdio.h> #include<conio.h> void main() { float a,p,l,b; clrscr(); printf("\n enter the length and breadth of rectangle"); scanf("%f%f",&l,&b); a=l*b; p=2*(l+b); printf("\n the area of rectangle is %f and the perimeter is %f",a,p); getch(); }

The above image code is written in code blocks
Output:
enter the length and breadth of rectangle 20(press enter) 10(press enter) the area of rectangle is 200 and the perimeter is 60


Explanation of the above code: Declaring of variables in data type float since length and breadth cannot always be integers.Taking input of length and breadth together by using scanf function.Substituting the values of length and breadth stored in l and b to find out area and perimeter.Displaying the result.
Q2. Write a programme to calculate average of 5 numbers by taking input from user.
Ans:

C Programming Basics

C PROGRAMMING BASICS:
1. Introduction to C language: C language was invented in Bell Labs by Dennis Ritchie between 1972-73. C language is a case sensitive language i.e the input given to it varies according to upper and lower case letters. It is executed using binary form data such as (0,1). By using binary data the speed of executing a code increases.
1.1 Header Files:

Header files are those files which contain some predefined functions in it which we are going to use in our code. Every header file is accessed by appending an extension ".h".
Example: #include<stdio.h> ↓                   ⇡
         Tells computer to                  header file with 
         include the header                 extension .h
         file          
There are many header files for different functions such as the following: <conio.h><math.h><string.h>Etc.

1.2 Starting of code and basic Syntax:

void main() or int main()

This tells the computer from where the code is starting. It is wri…