Programming in C Presentation upto FILE

DIPTA SAHA Diptasaha.lpu.cse@gmail.com

History Of C is a middle level programming language.which is developed by Dennis Ritchie while working at AT&T Bell Labs in USA in between 1969 and 1973.

{ First C Program; }  1#include<stdio.h>  2 int main()  3 {  4 printf("Hello C");  5 return 0;  6 }

{ Comments in C Program; } Single Line comment /*…comments…..*/ Multi Line Comments /* Comments */

{ Local Variable in C; } A local variable is a variable that is declared inside a function.

{ Global Variable in C; } A Global variable is a variable that is declared Outsite a function.

{ Size of Data type in C; } int 2 -32768 to +32767 long 4 -2,147,483,648 to 2,147,483,647 Float 4 1.2E-38 to 3.4E+38 Double 8 2.3E-308 to 1.7E+308 Char 1 -128 to +127 Data Type Name Size(Byte) Range

{ Variable Declaration in C; }  Syntax Datatype_name variable_name; or Datatype_name variable_name = values; Example Int a; Or Int a = 100;

{ Constant Variable Declaration in C; }  Syntax Const Datatype_name variable_name = values; Example Const float pi = 3.1416;

{ Escape Sequence in C; } •n (newline) •t (tab) •v (vertical tab) •f (new page) •b (backspace) •r (carriage return) •n (newline)

{ get From User in C; }  Syntax scanf("%d",&i); Example Int a; Scanf(“%d”,&a);

{ Simple Program for get From User in C; }

{ Operator in C; } C language is rich in built-in operators and provides the following types of operators − 1. Arithmetic Operators 2. Relational Operators 3. Logical Operators 4. Bitwise Operators 5. Assignment Operator

{ Condition Operator in C; } Syntax: (condition) ? True_res : false_res; #include <stdio.h> int main() { int x=1, y ; y = ( x ==1 ? 2 : 0 ) ; printf("x value is %dn", x); printf("y value is %d", y); }

{ Simple Program Using Operator in C; }  1 #include<stdio.h>  2int main()  3{  4 int a=10,b=5;  5 int add = a+b;  6 int sub = a-b;  7 int mul = a*b;  8 int div = a/b;  9 printf(“Add = %d”,add);  10 printf(“Sub = %d”,sub);  11 printf(“mul = %d”,mul);  12. printf(“div = %d”,div);  13return 0;  14}

{ Conditional Execution in C; } In the c programming have some decision making Statement. 1. if statement 2. if...else statement 3. nested if statements 4.switch statement 5. nested switch statements

{ If Condition in C; }  Syntax If(condition) { Statement..1; Statement..2; Statement..n; }

{ Simple Program using If Condition in C; }

{ if else Condition in C; }  Syntax If(condition) { Statement; } Else { Statement; }

{ Simple Program using If else Condition in C; }

{ Nested if Condition in C; }  Syntax If(condition) { Statement; if(condition) { Statement; } }

{ Switch Statement in C; }  Syntax Switch(expression) { Case constant_expression_1: Statement 1; Break; Case constant_expression_2: Statement 2; Break; Case constant_expression_3: Statement 3; Break; Default: Statement 4; }

{ nested Switch Statement in C; }  Syntax Switch(expression-1) { Case constant_expression_1: Switch(expression-1) { case constant_expression : statement; break; } Break; Case constant_expression_2: Statement 2; Break; Default: Statement 3; }

{ Types of Loops in C; } 1. while loop 2. for loop 3. do...while loop 4. nested loops

{ while Loop in C; } Syntax Initialization; While(condition) { Statement..1; Statement..2; Statement..n; increment/decrement; }

{ A simple Program using While Loop in C; }

{ for Loop in C; } Syntax for(Initialization;condition; increment/decrement) { Statement..1; Statement..2; Statement..n; }

{ A simple Program using For Loop in C; }

{ do while Loop in C; } Syntax Initialization; do { Statement..1; Statement..2; Statement..n; increment/decrement; } While(condition)

{ A simple Program using Do While Loop in C; }

{ nested for Loop in C; } Syntax for(Initialization;condition; increment/decrement) { Statement..1; for(Initialization;condition; increment/decrement) { Statement..1; Statement..2; Statement..n; } }

{ Break Statement in C; } The break statement terminates the loop body immediately and passes control to the next statement after the loop. Break statement are mainly used with loop and switch statement.

{ A Simple Program Using Break Statement in C; }

{ Continue Statement in C; } The continue statement in C programming works somewhat like the breakstatement.

{ A Simple Program Using continue Statement in C; }

{ Function in C; } Syntax Return_type function_name(argument) { statement; return need_variable; } Example: Int sum(int x,int y) { return x+y; }

{ Function call in C; } Syntax: Function_name(parameter or argument); Example: 1 #include<stdio.h> 2 int main() 3 { 4 Int z=sum(10,20); 5 printf(z); 6 return 0; 7 }

{ Single Dimensional Array in C; } Syntax data_type array_name [size];

{ Multi Dimensional Array in C; } Syntax data_type array_name [row_size][column_size];

{ A simple program using 1D Array in C; }

{ * Pointer in C; } A pointer is a variable whose value is the address of another variable. Like any variable or constant, you must declare a pointer before using it to store any variable address.

{ Declaration of Pointer in C; } Syntax data_type *var_name; Example int var = 20; int *ip; ip = &var;

{ A Simple Program Using Pointer in C; }

{ File in C; } file is a place on your physical disk where information is stored. Open a File FILE *name; name = fopen(“text.txt","a"); fclose(name);

{ File in C; } Write in a File FILE *name; name = fopen(“text.txt",“w"); If(name == NULL) { printf(“File Dose Not exist”); } else { for(i = 0; i < 10;i++){ fprintf (fp, "This is line %dn",i + 1); } fclose(name); }

{ File in C; } Read in a File FILE *name; name = fopen(“text.txt",“w"); Char buff[200]; If(name == NULL) { printf(“File Dose Not exist”); } else { while(fscanf(fp, "%s", buff)!=EOF){ printf("%s ", buff ); } fclose(name); }

Programming in C Presentation upto FILE

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