Solutions : Pointers - Part II

[Q001] 

 /* Print Freshersworld on each line, forming a diagonal pattern */
 #include<stdio.h>
 #include<conio.h>
 #include<dos.h>
  void main()
    {
       char str[]="Freshersworld";
       int x=1,y;
       for (y=1; y<=25; y++) 
         {
             clrscr();
             gotoxy(x,y);
             printf("%s",str);
             delay(250);
               if (y < 8)
                  x+=2;
               else
                  x+=3;
         }
} /* End of main */

 [Q002] 

 /* Compute the sum of values in the variable argument list */
  #include<stdio.h>
  #include<stdarg.h>
    int Sum(int a,...)
      {
        int total=a;
        va_list ap;
        int arg;
        va_start(ap,a);
    while ((arg = va_arg(ap,int)) != 0)
        {
          total+=arg;
        }
        va_end(ap);
        return total;
     }
     void main()
      {
        clrscr();
        printf("%d",Sum(5,6,7,8,9,10));
        getch();
   } /* End of main */

// Compute the sum of two values using function and return the result w/o using RETURN statement
#include<stdio.h>
#include<conio.h>
 int Sum(int a,int b)
  {
    _AX = a + b; // equivalent to : return (a + b);
  }
  void main(void)
   {
     clrscr();
     printf("Result is = %d",Sum(4,6));
     getch();
   } /* End of main */

/* To swap the contents of two variables using 'asm' statement */
#include<stdio.h>
#include<conio.h>
void main()
 {
  int val=85,num=77;
  clrscr();
  printf("Before swapping : %d and %d",val,num);
  asm mov ax,val
  asm mov cx,num
  asm mov num,ax
  asm mov val,cx
  printf("\n\nAfter swapping : %d and %d",val,num);
 } /* End of main */

 /* To find largest of two numbers using 'asm' statement */
#include<stdio.h>
#include<conio.h>
void main()
  {
   int val=85,num=77;
   clrscr();
   asm mov ax,val
   asm cmp ax,num
   asm jg FirstNum
   asm mov ax,num
   FirstNum:printf("Largest of two numbers is %d",_AX);
 } /* End of main */

 (a)


/* To print the above pattern or output using asm statement */
#include<stdio.h>
#include<conio.h>
 void main(void)
  {
    int i=5,j;
    clrscr();
    // asm statement doesn't end with semicolon (starts with 'asm' keyword)
    asm mov ax,i // Move the value of 'i' to accumulator (ax) 
    Loopi: j=i;
    Loopj: printf("*"); // Print asterisk (*)
    j=j-1;
    asm mov cx,j // Decrement the counter : Inner Loop
    asm cmp cx,0
    asm jnz Loopj // Terminate the Inner Loop if counter is 0, otherwise goto Loopj
    i=i-1;
    printf("\n"); 
    asm mov ax,i // Decrement the counter : Outer Loop
    asm cmp ax,0
    asm jnz Loopi // Terminate the Outer Loop if counter is 0, otherwise goto Loopi
    getch();
 } /* End of main */

*****
****
***
**
*

(b)


/* To print the above pattern or output using asm statement */
  #include<stdio.h>
  #include<conio.h>
  void main(void)
   {
     int i=1,j;
     clrscr();
      // asm statement doesn't end with semicolon (starts with 'asm' keyword)
      asm mov ax,i // Move the value of 'i' to accumulator (ax) 
      Loopi:j=0;
      Loopj:printf("*"); // Print asterisk (*)
      j=j+1;
      asm mov cx,j // Increment the counter : Inner Loop
      asm cmp cx,i 
      asm jnz Loopj // Terminate the Inner Loop if Inner Loop counter = Outer Loop counter
      i=i+1;
      printf("\n");
      asm mov ax,i // Increment the counter : Outer Loop
      asm cmp ax,6
      asm jnz Loopi // Terminate the Outer Loop if counter = 6
      getch();
   } /* End of main */

   [HINT : USE 'asm' statement]

*
**
***
****
*****

/* To reverse the words in a given line of text */
 #include<stdio.h>
 #include<string.h>
  void main()
    {
      char ch,str[80],*res="",*temp,*temp1;
      clrscr();
      printf("Enter a sentence :\n");
      scanf("%[^\n]",str);
      temp=strtok(str," ");
      do
      {
         strcpy(temp1,temp);
         strcat(temp1," ");
         strcat(temp1,res);
         strcpy(res,temp1);
         temp=strtok(NULL," ");
      }while (temp != NULL);

      printf("\n Result : %s",res);
      getch();
    } /* End of main */

/* To reverse a given line of test using recursive function */
 #include<stdio.h>
 #include<conio.h>
 void reverse(void)
  {
    char c;
    if ((c = getchar()) != '\n')
    reverse();
    putchar(c);
    return;
  }
  void main()
   {
     clrscr();
     printf("Please enter a line of text below\n");
     reverse();
   } /* End of main */