Reverse of a string using pointers

#include<stdio.h>
#include<conio.h>
void main()
{
int i,j;
char *a;
clrscr();
printf("enter a string");
scanf("%s",a);
i=0;
while(*(a+i)!='\0')
i++;
for(j=i-1;j>=0;j--)
printf("%c",*(a+j));
getch();
}

C Program for Factorial of a Number using Recursive Functiol

#include<stdio.h>
#include<conio.h>
long int factorial(int n);
void main()
{
int n;
clrscr();
printf("Enter the number:\n\n");
scanf("%d",&n);
printf("Factorial of %d is %ld",n,factorial(n));
getch();
}
long int factorial(int n)
{
if(n<=1)
{
return(1);
}
else
{
n=n*factorial(n-1);
return(n);
}
}

Switch Case control structure

SWITCH stmt is used for handling n number of decisions at a time.

 Hence it is also known as multi way decision making stmt.

SWITCH STATEMENT can't be applied to float and double.

 Break stmt transfers the control out of the switch stmt.

Syntax

switch(choice)

  {

  case 1:block of stmt:-1;

  break;

  case 2:block of stmt:-2;

  break;

  …………………….

  ……………………..

  ………………………

  case n:    block of stmt:-n;

  break;

  default: invalid stmt;

  break;

  }

sample program 

Logical operators workshop

Logical && and logical || 

logical && : If all are true then only true otherwise false.

logical || : if any one is true then it is true otherwise false.

Program on logical operators 

 A company insures its drivers in the following cases:

− If the driver is married.

− If the driver is unmarried, male & above 30 years of age.

− If the driver is unmarried, female & above 25 years of age.

In all other cases the driver is not insured. If the marital status, sex and age of the driver are

Else-if Control Structure

Else-if:

      A Multipath decision is a chain of ifs in which the statement associated with each else is an if.

Syntax:

  if(condition-1)

  stmt-1;

     else if(condition-2)

         stmt-2;

  else if(condition-3)

     stmt-3;

      ………………….

      else if(condition-n)

        stmt-n;

  else

  defalut stmt;

stmt-x;

Sample Program :

If else control structure

C  uses the keyword if-else to implement the decision control instruction.

Syntax

if(test condition-1)

{

             if(test condition-2)

  {

                block of stmt-1;

  }

  else

  {

                  block of stmt-2;

               }

}

  else

  {

     block of stmt-3;

  }

Stmt-x;

Note: braces are mandatory when, corresponding to if or else statement, multiple steps are to be executed.

Sample program 

If Control Structure

if   

C  uses the keyword if to implement the decision control instruction.

if statement can’t terminate with semicolon, but by mistake if we terminate ,compiler won’t give any error.

Syntax

if (test condition)

{

------------------------------------

------------------------------------

-------------------------------------               block of statements

--------------------------------------

}

Stmt-x;

Sample if program

Schaum's Outline of Programming with C

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Simplified pattern code

#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,k,a=4;
clrscr();
for(i=0;i<5;i++)
{
for(j=0;j<9;j++)
{
if((j>7-i||j<i+1)
printf("%d ",a);
else
printf("  ");
}
printf("\n");
a--;
}
getch();
}

C Pattern code

#include<stdio.h>
#include<conio.h>
void main()
{
 int i,j,k;
 clrscr();

C code for swapping of two numbers without using 3rd varible,+,-,*,/

#include<stdio.h>
#include<conio.h>
void main()
{
int x,y;
clrscr();
printf("\n enter the elements\n");
scanf("%d%d",&x,&y);
printf("\n before swaping x=%d,y=%d",x,y);
x=x^y;
y=y^x;
x=x^y;
printf("\n after swaping x=%d y=%d",x,y);
getch();
}

List of escape sequence in C:

An escape sequence is a character used in C which is not printed in Screen while printing it.It is a character combination consisting of a backslash (\) which is followed by a letter or a combination of digits.
Escape sequence is a single character and thus can be stored in a character constant.

List of escape sequence in C:
The following list contains a list of  escape sequence in ANSI C and their use:
\a is used to give an audible alert or beep sound.
\0 is used to print a null character.
\b is used to delete one character to the left of cursor , equivalent to backspace.
\f is used for form feed , or to feed a blank page when printing documents.
\t is used for horizontal tab , or to move the cursor to nest tab stop position.
\n is used for line feed , or to feed a blank line while printing documents.
\v is used for vertical tab , or to assign more space from the previous line.
\r is used for carriage return , or to move the cursor to the nest line during typing.
\\ is used to print a backslash.
\’ Is used to print a single quote.
\” is used to print a double quote.

Understanding C program execution

Animation of program execution

This animation shows the execution of a simple C program. By the end of this article you will understand how it works!
The C programming language is a popular and widely used programming language for creating computer programs. Programmers around the world embrace C because it gives maximum control and efficiency to the programmer.
If you are a programmer, or if you are interested in becoming a programmer, there are a couple of benefits you gain from learning C:

• You will be able to read and write code for a large number of platforms -- everything from microcontrollers to the most advanced scientific systems can be written in C, and many modern operating systems are written in C.

The-C-programming-language-Ritchie-Kernighan

Dennis Ritchie

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Program using printf() and scanf()

printf(): It displays output on the screen.

scanf(): It accepts input from user.

#include <stdio.h>

int main()

Precedence & Associativity of operators

Operators in C

There are three types of operators. A unary expression consists of either a unary operator prepended to an operand, or the sizeof keyword followed by an expression. The expression can be either the name of a variable or a cast expression. If the expression is a cast expression, it must be enclosed in parentheses. A binary expression consists of two operands joined by a binary operator. A ternary expression consists of three operands joined by the conditional-expression operator.

C includes the following unary operators:

Input and Output functions in C

printf

This offers more structured output than the putchar. Its arguments are, in order; a control string, which controls what get printed, followed by a list of values to be substituted for entries in the control string.

The prototype for the printf() is:

First C Program

Open command prompt

C:\TC\BIN > TC.EXE

Select New from the File menu.

Type the program in the editor.

Rules that are applicable to all C programs

                                                                                                                

   (a)  Each instruction in a C program is written as a separate statement. Therefore a complete C program

 would comprise of a series of statements.

     (b)  The statements in a program must appear in the same order in which we wish them to be

            executed; unless of course the logic of the problem demands a deliberate ‘jump’ or transfer of

            control to a statement, which is out of sequence.

     (c)  Blank spaces may be inserted between two words to improve the readability of the statement. 

           However, no blank spaces are allowed within a variable, constant or keyword

     (d)  All statements are entered in small case letters.

     (e)  C has no specific rules for the position at which a statement is to be written. That’s why it is 

          often called a free-form language.

     (f)  Every C statement must end with a ;. Thus ; acts as a statement terminator. 

Keywords,Variables and Constants in C

"Keywords" are words that have special meaning to the C compiler.Keywords are also called Reserved words.

Following are the keywords of C language

                                                          32 keyword's in C language

Variables

A Variable is a meaningful name of data storage location in computer memory. When using a variable you refer to memory address of computer.

Data Types in C

1. C has a concept of 'data types' which are used to define a variable before its use.

   C language provides various data types for holding different kinds of values.

   
   

   
   

                                                             Data Types in C

   
   

   

   
   

   
   

                                  
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

                                  Range of different datatypes in C 

   
   

Why Flow Chart ?

A flow chart is a graphical or symbolic representation of a process. 

What is C

Why ?

To develop device drivers at lower level,

Most popular in Virtual reality Systems, Embedded Systems,

Widely used in UNIX operating system development.

Who ?

It was designed and written by a man named Dennis Ritchie 

Where and When?

C Program to Disable and Enable Usb Port

 

Logic of the program
The logic of the program is simple. The 'C' source file block_usb.c writes the DWORD value of 4 (100 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" to 'lock' the USB ports.

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C program to Input and Show a Password

How To Execute C Source Code

We Know how to execute C program in C Editor

Now We see how to execute the programs find on Internet

C Code to Find Armstrong Numbers

An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371.