TRICKY C PROGRAMS

ILLUSTRATE CALL BY REFERENCE:

/*To illustrate call by refrence */

#include<stdio.h>
#include<conio.h>
void main()
{
 int x,y,swap(int *x,int *y);
 clrscr();

 printf ("\n\n Enter the first number : ");
 scanf("%d",&x);

 printf ("\n\n Enter the second number : ");
 scanf("%d",&y);

 printf("\n\n\n The value of x & y before swapping are %d & %d",x,y);

 swap(&x,&y);

 printf("\n\n The value of x & y after  swapping are %d & %d",x,y);

 getch();
}




void swap(int *x,int *y)
{

int t;
t  = *x ;
*x = *y ;
*y = t ;

}

     SWAPPING TWO POINTERS:

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

void main()
 {
  int a[10],i,n=5,swap(int *ptr2,int *ptr4);
  clrscr();

  printf("\n\n Enter %d elements : \n",n);
  for(i=0;i<n;i++)
  scanf("%d",&a[i]);

  swap(&a[2],&a[4]);

  printf("\n\n The resultant matrix is : \n");
  for(i=0;i<n;i++)
  printf("a[%d] = %d\n",i,a[i]);

  getch();

 }


  void swap(int *ptr2,int *ptr4)
  {
   int t;
   t = *ptr2;
   *ptr2 = *ptr4;
   *ptr4 = t;
  }

  ALPHABETIC SORT:

    #include<stdio.h>

    

  void main()

  {

char t[100],string[100][100];

int i,j,numbers;

clrscr();

printf("\n\n How many numbers to be stored in array : ");

scanf("%d",&numbers);

if(  (numbers < 0)   ||   (numbers > 100)  )

{

 printf("\n\n Enter numbers to be stored in between 1 & 100");

 printf("\n\n\n\n PRESS ANY KEY TO CONTINUE..............");

 getch();

 exit(0);

}

printf("\n Enter %d strings : \n ",numbers);

for(i=1 ; i <= numbers ; i++)

{

 scanf("%s",string[i]);

}

for(i=1 ; i <= numbers-1 ; i++)

{

 for(j=1 ; j <= numbers-i ; j++)

 {

if ( strcmp( string[j] , string[j+1] ) > 0 )

{

strcpy(t , string[j]);

strcpy(string[j] , string[j+1]);

strcpy(string[j+1] , t);

}

 }

   }

printf("\n The sorted string in alphabetical order are :  \n\n");

for(i=1 ; i <= numbers ; i++)

{

 printf("%s \n", string[i]);

}

printf("\n\n\n PRESS ANY KEY TO CONTINUE........");

getch();

  }