WAP to swap two numbers using call by reference method

/*
  Name: WAP to swap two numbers using call by reference method
  Author: Parveen Malik
  Date: 23/09/11 11:43
*/


#include <stdio.h>
#include <conio.h>

void swap(int*,int*);


int main()
{
    int x,y;
    printf("Enter the value of x and y \n");
    scanf("%d%d",&x,&y);
    printf("Before swapping\nx = %d\ny = %d\n",x,y);
    swap(&x,&y);
    printf("After swapping\nx = %d\ny = %d",x,y);
    getch();
    return 0;
}


void swap (int *a, int *b)
{
     int temp;
     temp=*a;
     *a=*b;
     *b=temp;
     }


OUTPUT : 

     

WAP to swap two numbers without using third variable

/*
  Name: WAP to swap two numbers without using third variable
  Author: Parveen Malik
  Date: 23/09/11 11:34
*/
#include <stdio.h>
#include <conio.h>
 int main()
 { 
     int x,y;
     printf("Enter the value of x and y \n");
     scanf("%d%d",&x,&y);
     printf("Before swapping\nx = %d\ny = %d",x,y);
     x=x+y;
     y=x-y;
     x=x-y;
     
     printf("\nAfter swapping\nx = %d\ny = %d\n",x,y);
     getch();
             return 0;
             }

OUTPUT : 

WAP to swap two numbers using third variable

/*
  Name: WAP to swap two numbers using third variable
  Author: Parveen Malik
  Date: 23/09/11 10:50
*/


#include <stdio.h>
#include <conio.h>


int main()
{
    int x,y,temp;
    printf("Enter the value of x and y \n");
    scanf("%d%d",&x,&y);
    printf("Before swapping \nx = %d\ny = %d",x,y);
    temp=x;
    x=y;
    y=temp;
    printf("\nAfter swapping \nx = %d\ny = %d",x,y);
    getch();
    return 0;
}


OUTPUT : 

WAP to add n numbers

/*
  Name: WAP to add n numbers
  Author: Parveen Malik
  Date: 23/09/11 10:43
*/


#include <stdio.h>
#include <conio.h>


int main()
{
int n,sum=0;
int count,var;
printf("Enter the number of integers you want to add : ");
scanf("%d",&n);
printf("Enter %d numbers \n",n);
for(count=1;count<=n;count++)
{
                             scanf("%d",&var);
                             sum=sum+var;
                             }
                             printf("Sum of entered numbers = %d \n",sum);
                             getch();
                             return 0;
                             }


OUTPUT : 

WAP to find factorial of a given number without using recursion

/*
  Name: WAP to find factorial of a given number without using recursion
  Author: Parveen Malik
  Date: 23/09/11 10:21
*/


#include <stdio.h>
#include <conio.h>


long factorial(int);
void main(void)
{
     int num;
     long fact=1;
     printf("Enter a number to calculate its factorial : ");
     scanf("%d",&num);
     printf("%d = %ld \n",num,factorial(num));
     getch();
     }
     long factorial(int n)
     {
          int count;
          long result=1;
          for(count=1;count<=n;count++)
          result=result*count;
          return (result);
          }


OUTPUT:

WAP to add digits of entered number

/*
  Name: WAP to add digits of entered number
  Author: Parveen Malik
  Date: 23/09/11 09:41
*/


#include <stdio.h>
#include <conio.h>


int main()
{
    long num;
    int sum=0,rem;
    printf("Enter a number \n");
    scanf("%ld",&num);
    while(num!=0)
    {
                 rem=num%10;
                 sum=sum+rem;
                 num=num/10;
                 }
                 
                 printf(" Sum of digits of entered number is : %d",sum);
                 getch();
                 return 0;
                 }


OUTPUT : 

WAP to check if it is a leap year

/*
  Name: WAP to check Leap Year
  Author: Parveen Malik
  Date: 23/09/11 09:39
*/


#include <stdio.h>
#include <conio.h>


int main()
{
int year;
printf("Enter a year to check if it is a leap year \n");
scanf("%d",&year);


if(year%400==0)
printf("%d is a leap year .\n",year);
else if(year%100==0)
printf("%d is not a leap year.\n",year);
else if(year%4==0)
printf("%d is a leap year.\n",year);
else
printf("%d is not a leap year.\n",year);
getch();
return 0;
}


OUTPUT : 

WAP to display the message "Hello World" without a Semicolon.

There are many ways to do this but i'm showing you three ways to print "Hello World" without putting any semicolon.


Solution:1

#include <stdio.h>
#include <conio.h> 
void main( )
{
if(printf("Hello World"))
{
}
getch();
}


Solution:2


#include <stdio.h>
include <conio.h>

void main( )
{
swicth(printf("Hello World"))
{
}
getch();
}




Solution:3


#include <stdio.h>
#include <conio.h>

void main( )
{
while(printf("Hello World"))  /*infinite loop*/
{
}
getch();
}

WAP to print all Armstrong numbers between 1 to 1000

/*
  Name: WAP to print all Armstrong numbers between 1 to 1000
  Author: Parveen Malik
  Date: 18/09/11 10:45
*/


#include <stdio.h>
#include <conio.h>


int main()
{
int no, temp, rem, sum;


printf("Armstrong numbers between 1 and 1000 are:\n");
for(no=1; no<=1000; no++)
{
temp=no;
sum=0;
while(temp>0)
{
rem=temp%10;
sum=sum+(rem*rem*rem);
temp=temp/10;
}
if(no==sum)
printf("\n%d", no);
}
getch( );
return 0;
}
    
OUTPUT: 

WAP to print all combinations of characters A,B,C

/*
  Name: WAP to print all combinations of characters A,B,C
  Author: Parveen Malik
  Date: 18/09/11 10:19
*/
#include<stdio.h>
#include<conio.h>


int main()
{
    char ch1, ch2, ch3;


for(ch1='A' ; ch1<='C' ; ++ch1)
{
            printf("\n");
for(ch2='A' ; ch2<='C' ; ++ch2)
for(ch3='A' ; ch3<='C' ; ++ch3)
printf(" %c%c%c", ch1, ch2, ch3);
}
getch( );
return 0;
}


OUTPUT: 

WAP to check whether the entered number is positive,negative or zero

/*
  Name: WAP to check whether the entered number is positive,negative or zero
  Author: Parveen Malik 
  Date: 18/09/11 09:52
*/


#include<stdio.h>
#include<conio.h>
 int main()
 {
      long num;
      printf("\n\n\nEnter any number : ");
      scanf("%ld",&num);
      if(num>0)
      printf("\n%d is a positive number ",num);
      else if(num<0)
      printf("\n%d is a negative number ",num);
      else
      printf("\n%d is zero ",num);
      main();
      return 0;
      }


OUTPUT:

      

WAP to construct a pyramid of numbers.

/*
  Name: WAP to construct a pyramid of numbers.
  Author: Parveen Malik
  Date: 18/09/11 09:26 
*/


#include<stdio.h>
#include<conio.h>


int main()
{
    int i,j,num;
    printf("Enter the value of last number to be printed : ");
    scanf("%d",&num);
    for(i=1;i<=num;i++)
    {
                       printf("\n");
                       for(j=1;j<=i;j++)
                       {
                                        printf("%3d",j);
    
                                        }
                                        }
                                        getch();
                                        return 0;
                                        }
                                        
                                         

OUTPUT:

Program to calculate simple interest.

/*
Name: Program to find out Simple interest
Author: Parveen Malik
Date: 03/01/11 18:45
*/

#include<stdio.h>
#include<conio.h>


void main()
{
float rate,time,prin; // declaring rate, time and principle
float si; // simple interest

printf("Enter the value of\n\nPrinciple : "); // taking user
scanf("%f",&prin); //principle
printf("Rate : ");
scanf("%f",&rate);
printf("Time : ");
scanf("%f",&time);


si=prin*rate*time/100; //formula of finding simple interest
printf("\nSimple Interest : %.2f",si); // printing simple interest to the console

getch();
}

[caption id="attachment_55" align="aligncenter" width="800" caption="OUTPUT:"][/caption]

Program to calculate area of a circle

/*
Name: Program to calculate area of a circle
Author: Parveen Malik
Date: 03/01/11 19:46
*/

#include<stdio.h>
#include<stdio.h>
#define PI 3.141 // to define value of pi


void main()
{
int radius;
float area;

printf("Enter the radius of the Circle : ");
scanf("%d",&radius);

area=PI*radius*radius; // formula to find the area of a circle
printf("\nArea of the Circle is : %.2f",area);

getch();
}

OUTPUT:

[caption id="attachment_12" align="aligncenter" width="656" caption="OUTPUT"][/caption]

Program to find out sum of any two integers.

/*
Name:  Program to find out sum of any two integers.
Author: Parveen Malik
Date: 02/01/11 16:05
*/

#include<stdio.h>
#include<conio.h>   // preprocessor section


void main()
{
int n1,n2,sum; //declare integers

printf("Enter any two integers \n");
scanf("%d%d",&n1,&n2); // for the user input

sum=n1+n2;

printf("\n\n%d + %d = %d",n1,n2,sum); // to print the sum


getch();
}

[caption id="attachment_11" align="aligncenter" width="655" caption="OUTPUT"][/caption]

First Program "hello world"

Here is the first program from which you can start your programming as i did. C is a general purpose programming language developed by Dennis Ritchie at Bell Laboratories(1972).
C is the one of the most popular language of all the time. C is  influenced by B, BCPL, CPL, ALGOL, Assembly, FORTRAN, PL/I and it has influenced many languages like C++, C--, C#, Objective C, BitC, D, Java, JavaScript, PHP, Perl, Pike , LPC and Python etc.
Look at the program below and try to understand it.



/*  Name: hello world
Author: Parveen Malik,,
Date: 02/01/11 15:11      // comment section
*/


#include<stdio.h> // header section
#include<conio.h>


void main() //program starts from here
{
printf("hello world"); // Prints the "hello world" on console screen

getch();

} //exit

[caption id="attachment_8" align="aligncenter" width="662" caption="OUTPUT"][/caption]