This lab report discusses an introduction to C programming. It provides background that C was created in 1972 and is a structured, popular language. It then covers some key concepts of C syntax including tokens, keywords, identifiers, strings, constants, variables, data types, semicolons, and comments. The report includes three programs - one printing a simple "Hello World" message, one calculating the sum of two numbers, and one performing summation, subtraction and multiplication of two user-input numbers. The conclusion reflects that the report helped the student learn fundamental C programming concepts.

1. Lab Report
Computer Applications and Programming (sessional)-3701
.
Submitted by:-
Name:- Mahbubay Rabbani
ID:-175035
Semester & Year:-3/1
Department:-TE
Submitted to:-
Md.Khawja Imran Masud
Lecturer
Department of CSE
Dhaka University of Engineering & Technology (DUET), Gazipur

2. Report No.:-01
Report Name:-Introduction to C programming.
Lab Date:-14.03.2021
Date of submission:-21.03.2021
Theory
C is a programming language which is also called the mother of all programming
languages. This programming language is developed by Dennis Ritchie in 1972.C is
structured and more popular programming language. It contains only 32 keywords
and it also capable of quick running.
Like of all languages, C has a basic syntax.
1. Tokens:-It is a syntax part of C language.
Token is either a keyword, an identifier, a string, a constant or a symbol. They are
explained in the following.
Keyword:-It is a reserved word and expressed by small letter.There are 32
keywords. But we can not use them as variable name, constant name etc.
Identifier:-identifier is a name which is used for identifying any variables or
functions. It can be expressed by capital or small letters or mix with underscore and
numbers. But it can’t allow the special symbols (@, $, %).
String is statement with both sides inverted comma symbol.
Constant is a variable which has fixed value.
Variables is a quantity in which the data types are stored.
There are 5 data types:-
i. Integer
ii. Floating Point
iii. Character
iv. Double floating point
v. Void
They are expressed as int, float, char, double, void respectively.
2. Semicolons:- It is an another part of C syntax. It is the symbol which terminates
the statement in a program and used in every program.
3. Comments:- Comments are like helping text which are ignored by a Complier.
they are started with /* and ended with */

3. Program
1. Hello world program with introduction
Input:-
/*Hello world program with my introduction. */
#include<stdio.h>
int main()
{
printf("Hello World!n");
printf("I am Mahbubay Rabbani from DUETn");
printf("I am a student of department of TEn");
printf("My ID is 175035n");
printf("My home district is Gaibandha which belongs to Rangpur divisionn");
return 0;
}
Output:-

4. 2.Program about Summation of two numbers.
Input:-
/*Now I write a program about
the summation of two numbers*/
#include<stdio.h>
int main()
{
int a, b, result; /*a,b denote the input numbers*/
printf("The first number is=");
scanf("%d",&a);
printf("The second number is=");
scanf("%d",&b);
result=a+b;
printf("The summation of the numbers is=%d",result);
return 0;
}
Output:-

5. Task:- Write a C program by taking two inputs from keyboard and display the
summation, subtraction, multiplication of them.
Input:-
/*Now I write a program about
the summation,subtraction and multiplication of two numbers*/
#include<stdio.h>
int main()
{
int a, b, result; /*a,b denote the input numbers*/
printf("The first number is=");
scanf("%d",&a);
printf("The second number is=");
scanf("%d",&b);
result=a+b;
printf("The summation of the numbers is=%dn",result);
result=a-b;
printf("The subtraction of the numbers is=%dn",result);
result=a*b;
printf("The multiplication of the numbers is=%d",result);
return 0;
}
Output:-

6. Conclusion:- From this report I know about the fundamental concept of C
programming and also know how programming languages work for summation,
subtraction and multiplication. I think this report is very fruitful and helps in my
practical life.