2. introduction of a c program

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Structure Computer Programming with C-02 by Alamgir Hossain Topics Covered: Introduction of a C program with Proper Exam. From this slide you will learn all about a c program.

Introduction of a C Program
Md. Alamgir Hossain
Lecturer
Dept. of CSE, Prime University
Mail: alamgir.cse14.just@gmail.com

Which part is used for why??
#include <stdio.h> includes the standard input output library functions. The
printf() function is defined in stdio.h .
int main(); The main() function is the entry point of every program in c language.
printf(); The printf() function is used to print data on the console.
return 0; The return 0 statement, returns execution status to the OS. The 0 value is
used for successful execution and 1 for unsuccessful execution.

Variable in C
A variable is a name of the memory location. It is used to store data. Its value can
be changed, and it can be reused many times.
It is a way to represent memory location through symbol so that it can be easily
identified.
Let's see the syntax to declare a variable: type variable_list;
The example of declaring the variable is given below:
int a;
float b;
char c;
Here, a, b, c are variables. The int, float, char are the data types.

Variable in C
We can also provide values while declaring the variables as given below:
int a =10, b = 20; //declaring 2 variable of integer type
float f = 20.8;
char c = 'A';
Rules for defining variables
A variable can have alphabets, digits, and underscore.
A variable name can start with the alphabet, and underscore only. It can't start
with a digit. Not allow: int 9a;
No whitespace is allowed within the variable name. Not Allow: int ab cd;
A variable name must not be any reserved word or keyword, e.g. int, float, etc.
Valid variable names: int a; int _ab; int a30;
Invalid variable names: int 2; int a b; int long;

Basic Data Types Size and Range in C
Basic Data Type: int, char, float, double
Data Types Memory Size Range
char 1 byte -128 to 127{-(2
n-1
-1) to (2
n-1
)}
int 2 byte −32,768 to 32,767
float 4 byte
double 8 byte

Format Specifier in C
The Format specifier is a string used in the formatted input and output functions.
The format string determines the format of the input and output. The format string
always starts with a '%' character.
The commonly used format specifiers in printf() and Scanf() function are:
Format
specifier
Description
%d It is used to print the integer value.
%f It is used for printing the decimal floating-point values. By default,
it prints the 6 values after '.'.
%c It is used to print the unsigned character.
%lf Double Value

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2. introduction of a c program

1. Introduction of a C Program Md. Alamgir Hossain Lecturer Dept. of CSE, Prime University Mail: alamgir.cse14.just@gmail.com

2. Our first C program

3. Which part is used for why?? #include <stdio.h> includes the standard input output library functions. The printf() function is defined in stdio.h . int main(); The main() function is the entry point of every program in c language. printf(); The printf() function is used to print data on the console. return 0; The return 0 statement, returns execution status to the OS. The 0 value is used for successful execution and 1 for unsuccessful execution.

4. Variable in C A variable is a name of the memory location. It is used to store data. Its value can be changed, and it can be reused many times. It is a way to represent memory location through symbol so that it can be easily identified. Let's see the syntax to declare a variable: type variable_list; The example of declaring the variable is given below: int a; float b; char c; Here, a, b, c are variables. The int, float, char are the data types.

5. Variable in C We can also provide values while declaring the variables as given below: int a =10, b = 20; //declaring 2 variable of integer type float f = 20.8; char c = 'A'; Rules for defining variables A variable can have alphabets, digits, and underscore. A variable name can start with the alphabet, and underscore only. It can't start with a digit. Not allow: int 9a; No whitespace is allowed within the variable name. Not Allow: int ab cd; A variable name must not be any reserved word or keyword, e.g. int, float, etc. Valid variable names: int a; int _ab; int a30; Invalid variable names: int 2; int a b; int long;

6. Basic Data Types Size and Range in C Basic Data Type: int, char, float, double Data Types Memory Size Range char 1 byte -128 to 127{-(2 n-1 -1) to (2 n-1 )} int 2 byte −32,768 to 32,767 float 4 byte double 8 byte

7. Format Specifier in C The Format specifier is a string used in the formatted input and output functions. The format string determines the format of the input and output. The format string always starts with a '%' character. The commonly used format specifiers in printf() and Scanf() function are: Format specifier Description %d It is used to print the integer value. %f It is used for printing the decimal floating-point values. By default, it prints the 6 values after '.'. %c It is used to print the unsigned character. %lf Double Value

8. Printing Integer value in C

9. Printing Character value in C

10. Printing Float and Double value in C

11. Thank You

2. introduction of a c program

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