C lab sample programs

/* C program to swap two numbers without using temporary variables */
  
main()
{
     printf("\n enter any two values");
     scanf("%d%d",&a,&b);
     printf("\n Before swapping a=%d\tb=%d",a,b);
     a=a+b;
     b=a-b;
     a=a-b;
     printf("\n After swapping a=%d\tb=%d",a,b);
}

OUTPUT:
    enter any two values 5  10
    Before swapping a=5     b=10
    After swapping a=10     b=5
 


/* C program to find the roots of the quadratic equation */
main()
{
  int a,b,c,r1,r2,d;
  clrscr();
  printf("\n enter the coefficients of a quadratic equation");
  scanf("%d%d%d",&a,&b,&c);
  d=b*b-(4*a*c);
  if(d==0)
  {

     r1=-b/(2*a);
     r2=-b/(2*a);
     printf("roots are equal %d and %d",r1,r2);
  }
  if(d>0)
  {
     r1=(-b+sqrt(d))/(2*a);
     r2=(-b-sqrt(d))/(2*a);
     printf("roots are real %d and %d",r1,r2);
 }
 if(d<0)
 {
     printf("\n roots are imaginary");
 }
}

OUTPUT:
enter the coefficients of a quadratic equation
1  -2  1
roots are equal 1    1



/* C program to find the biggest of three numbers using ternary operator */
main()
{
  int a=7775,b=12,c=225,x;
  x=a>b?(a>c?a:c):(b>c?b:c);
  printf("biggest number is %d",x);

}

OUPUT:
biggest number is 7775



/* C program to  find the sum of digits of a given number */

main()
{
  int n,r,sum=0,n1;
  printf("\n enter any number");
  scanf("%d",&n);
  n1=n;
  while(n>0)
  {
     r=n%10;
     sum=sum+r;
     n=n/10;
  }
  printf("\n sum of digits of %d is %d",n1,sum);

OUTPUT:
enter any number
132
sum of digits of 132 is 6

/* C program to check whether the given number is palindrome or not */

main()
{
  int n,r,sum=0,n1;
  printf("\n enter any number");
  scanf("%d",&n);
  n1=n;
  while(n>0)
  {
     r=n%10;
     sum=(sum*10)+r;
     n=n/10;
  }
  if(sum==n1)
  printf("%d is palidrome  number",n1);
  else
  printf("%d is not palindrome number",n1);
}

OUTPUT:
enter any number
121
121 is a palindrome number




/* C program to check whether the given number is armstrong or not */

main()
{
  int n,r,sum=0,n1;
  printf("\n enter any number");
  scanf("%d",&n);
  n1=n;
  while(n>0)
  {
     r=n%10;
     sum=sum+(r*r*r);
     n=n/10;
  }
  if(sum==n1)
  printf("%d is armstrong number",n1);
  else
  printf("%d is not armstrong",n1);
}

OUTPUT:
enter any number
153
153 is armstrong




/* C program to check whether the given number is prime number or not */

main()
{
  int n,c=0,i;
  printf("enter a number");
  scanf("%d",&n);
  for(i=2;i<=n/2;i++)
  {
     if(n%i==0)
     {
c=1;
break;
     }
  }
  if(c==0)
  printf("%d is prime number",n);
  else
  printf("\n %d is not prime number",n);
}

OUTPUT:
enter a number 34
34 is not prime number



/* C program to print multiplication tables up to the given range */

main()
{
  int n,i,j;
  printf("\n enter your range");
  scanf("%d",&n);
  for(i=1;i<=n;i++)
  {
     for(j=1;j<=10;j++)
     {
printf("\n %d * %d = %d",i,j,i*j);
     }
      printf("\n ");
  }
}

OUTPUT:
enter your range 10



/* C program to print Fibonacci Sequence with in the given range */

main()
{
  int n,a=0,b=1,c;
  printf("enter your range");
  scanf("%d",&n);
  printf("\n %d \t %d",a,b);
  c=a+b;
  while(c<=n)
  {
    printf("\t%d",c);
    a=b;
    b=c;
    c=a+b;
  }
}

OUTPUT:

enter your range 25
0    1   1   2  3   5   8   13   21


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