C PROGRAMS

 1.  Program which prints block F using # character

       #include<stdio.h>

void main()

 {

   clrscr();

   printf("#####\n");

   printf("#\n####\n");

   printf("#\n#\n#\n");

   getch();

 }

2.   Program which computes perimeter and area of a rectangle

    #include<stdio.h>

void main()

 {

   int height=7,width=5;

   int perimeter,area;

   clrscr();

   perimeter=2*(height+width);

   area=height*width;

   printf("Perimeter of rectangle is %d inches\n",perimeter);

   printf("Area of rectangle is %d square inches\n",area);

   getch();

 }

3. Program which displays multiple variables

      #include<stdio.h>

void main()

 {

   char cvar='P';

   int ivar=234;

   float fvar=567.25f;

   double dvar=123456789.1234567;

   clrscr();

   printf("Character variable cvar = %c\n",cvar);

   printf("Integer variable ivar = %d\n",ivar);

   printf("Float variable fvar = %f\n",fvar);

   printf("Double variable dvar = %g\n",dvar);

   getch();

 }

4. Program which calculates distance between two points

  

     #include<stdio.h>

#include<math.h>

void main()

 {

   int x1,y1,x2,y2;

   float dist;

   clrscr();

   printf("Enter the co-ordinates of first point: ");

   scanf("%d %d",&x1,&y1);

   printf("Enter the co-ordinates of second point: ");

   scanf("%d %d",&x2,&y2);

   dist=sqrt(pow(x2-x1,2)+pow(y2-y1,2));

   printf("Distance between the points is %.2f units\n",dist);

   getch();

 }

5.  Program which checks the relation among 4 variables

    #include<stdio.h>
void main()

 {

   int p,q,r,s;

   clrscr();

   printf("Enter 4 integers for p q r s : ");

   scanf("%d %d %d %d",&p,&q,&r,&s);

   if( (r>0) && (s>0) && (p%2==0) )

    {

      if( (q>r) && (s>p) && ((r+s)>(p+q)) )

       printf("Corect Values");

      else

       printf("Wrong Values");

    }

   else

    printf("Wrong Values");

   getch();

 }

6. Program which converts string to long integer

     #include <stdio.h>

#include <stdlib.h>

void main()

 {

   long l;

   char *lstr = "98765432";

   clrscr();

   l = atol(lstr);

   printf("String = %s Integer = %ld\n", lstr, l);

   getch();

}

7. Program which compute area of various geometrical shapes

#include<stdio.h>

void main()

 {

   int choice,b,h,r;

   float area;

   clrscr();

   do

    {

      printf("\nArea Calculation\n");

      printf("1.Rectangle\n");

      printf("2.Triangle\n");

      printf("3.Circle\n");

      printf("4.Exit\n");

      printf("Enter your choice: ");

      scanf("%d",&choice);

      switch(choice)

       {

case 1: printf("Enter length & breadth of rectangle: ");

scanf("%d %d",&h,&b);

area=h*b;

printf("Area of Rectangle is %.2f square units\n",area);

break;

case 2: printf("Enter base & height of triangle: ");

scanf("%d %d",&b,&h);

area=0.5*b*h;

printf("Area of Triangle is %.2f square units\n",area);

break;

case 3: printf("Enter radius of circle: ");

scanf("%d",&r);

area=(22/7.0)*r*r;

printf("Area of Circle is %.2f square units\n",area);

break;

case 4: break;

default:printf("Invalid choice\n");

       }

    }while(choice!=4);

 }

8. Program which calculates factorial of a number

     #include<stdio.h>

void main()

 {

   int i,n;

   long f=1;

   clrscr();

   printf("Enter a positive integer: ");

   scanf("%d",&n);

   for(i=1;i<=n;i++)

    f=f*i;

   printf("\nFactorial of %d is %ld",n,f);

   getch();

 }

9. Program which displays n even natural numbers and their sum

    #include<stdio.h>

void main()

 {

   int n,i,sum=0,count=0;

   clrscr();

   printf("How many even numbers to display? ");

   scanf("%d",&n);

   for(i=2;count<n;count++,i+=2)

    {

      printf("%d ",i);

      sum=sum+i;

    }

   printf("\nSum of the first %d even natural numbers is %d",n,sum);

   getch();

 }

10. Program which displays n terms of Harmonic series.1 + 1/2 + 1/3 + 1/4 + 1/5 + .... 1/n and their sum*/

#include<stdio.h>

void main()

 {

   int n,i;

   float sum=1.0;

   clrscr();

   printf("How many terms of Harmonic Series? ");

   scanf("%d",&n);

   printf("\n1");

   for(i=2;i<=n;i++)

    {

      printf(" + 1/%d",i);

      sum=sum+(1.0/i);

    }

   printf("\n\nSum of %d terms of the Harmonic Series is %.2f ",n,sum);

   getch();

 }

11. Program which checks whether a number is Armstrong number or not

      #include<stdio.h>

void main()

 {

   int n,t,r,sum=0;

   clrscr();

   printf("Enter an integer ");

   scanf("%d",&n);

   t=n;

   while(t>0)

    {

      r=t%10;

      sum=sum+r*r*r;

      t=t/10;

    }

   if(sum==n)

    printf("\n%d is Armstrong Number",n);

   else

    printf("\n%d is not Armstrong Number",n);

   getch();

 }

12. Program which prints all unique elements in an array

      #include<stdio.h>

void main()

 {

   int arr[10],freq[10];

   int i,j,count;

   clrscr();

   printf("Enter elements in array\n");

   for(i=0;i<10;i++)

    {

      printf("Enter an integer ");

      scanf("%d",&arr[i]);

      freq[i]=-1;

    }

   for(i=0;i<10;i++)

    {

      count=1;

      for(j=i+1;j<10;j++)

       {

if(arr[i]==arr[j])

  {

    count++;

    freq[j]=0;

  }

       }

      if(freq[i]!=0)

       freq[i]=count;

    }

   printf("\nUnique elements in the array are\n\n");

   for(i=0;i<10;i++)

    {

      if(freq[i]==1)

       printf("%d ",arr[i]);

    }

   getch();

 }