deleting an element from array using index

/****************************
*  Umang B Bhatt       *
*   bhatt.umang7@gmail.com  *
*****************************/

/**
 * program for scannign n numbers and deleting an element from that
 * using index
 */
#include<stdio.h>
void main()
{

 int n = 0 , i =0 ;

 int no[100];
 char c; // to ask the user whether he wants to continue or noe
 int delindex= -1 ; // to store the index no at which the user wants to delete

 printf("How many numbers you want to scan ? ");
 scanf("%d",&n);
 if(n < 0 || n>100)
 {

  // if the user enters invalid no of elemtns then we come here
  printf("Invalid number. It must be brtween 1 to 100");
 }
 else
 {
  // logic for scanning the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("Enter element %d: ", i);
   scanf("%d",&no[i]);
  }

  c = 'y';
  do
  {
   printf("\nEnter the index no from which you want to delete: ");

   scanf("%d",&delindex);

   // for error checking
   if(delindex < 0 || delindex >= n)
   {

    printf("Invalid number");
   }
   else
   {
    // we come here if the index is in valid range



    // the logic for moving the elements
    for(i = delindex ; i < n ;i++)
    { 
     // move the elements by one

     no[i] = no [i+1];
    }

    // n--  because one element is delted from it

    n--;
    
 
    printf("\nAfter delting the element at %d the array is:\n", delindex ) ;
    // now print the array after deleting the number
    for(i = 0 ; i < n ;i++)
    {

     printf("\nElement at index %d is : %d", i, no[i]);
    }
  
    
    // ask the user whether he/she wants to continue or not
    printf("\nDO you want to continue ? (y/n) : ");

    fflush(stdin);
    scanf("%c",&c);
    }
   }
  while(c!='n' && c != 'N'  );
 }

 printf("\n");
}

finding the biggest number from array

/****************************
*  Umang B Bhatt       *
*   bhatt.umang7@gmail.com  *
*****************************/

/**
 * program for scannign n numbers and finding the biggest from them
 */
#include<stdio.h>
void main()
{

 int n = 0 , i =0  , j = 0;

 int no[100];
 int biggest; // for storing the biggest number
 printf("How many numbers you want to scan ? ");

 scanf("%d",&n);
 if(n < 0 || n>100)
 {

  // if the user enters invalid no of elemtns then we come here
  printf("Invalid number. It must be brtween 1 to 100");
 }
 else
 {
  // logic for scanning the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("Enter element %d: ", i);
   scanf("%d",&no[i]);
  }

  
  // assign biggest the first element's value
  biggest = no[0];
  // the logic for finding the biggest number
  for(i = 0 ; i < n ;i++)
  { 
   if(no[i] > biggest)
   {

    biggest = no[i];
   }
  }
  
  printf("The biggest number among those numbers is: %d" , biggest);

 }

 printf("\n");
}

sorting array in ascending order

/****************************
*  Umang B Bhatt       *
*   bhatt.umang7@gmail.com  *
*****************************/

/**
 * program for scannign n numbers and sorting them in ascending order
 */
#include<stdio.h>
void main()
{

 int n = 0 , i =0  , j = 0;

 int no[100];
 int temp; // for swapping the number
 printf("How many numbers you want to scan ? ");

 scanf("%d",&n);
 if(n < 0 || n>100)
 {

  printf("Invalid number. It must be brtween 1 to 100");
 }
 else
 {
  // logic for scanning the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("Enter element %d: ", i);
   scanf("%d",&no[i]);
  }

  
  // the logic for sorting the number 
  for(i = 0 ; i < n ;i++)
  { 
   for(j = 0 ; j < n ; j++  ) 
   {

    if(no[i] < no[j])
    {
     // if the number at index i is greater than the number at index j then swap the numbers
     temp = no[i];

     no[i] = no[j];
     no[j] = temp;
    }
   }
  }

  // logic for displaying the sorted array
  for(i = 0 ; i < n ;i++)
  { 
   printf("\nnumber at index %d is %d ", i , no[i]);
  }
 }

 printf("\n");
}

sorting array in descending order

/****************************
*  Umang B Bhatt       *
*   bhatt.umang7@gmail.com  *
*****************************/

/**
 * program for scannign n numbers and sorting them in descending order
 */
#include<stdio.h>
void main()
{

 int n = 0 , i =0  , j = 0;

 int no[100];
 int temp; // for swapping the number
 printf("How many numbers you want to scan ? ");

 scanf("%d",&n);
 if(n < 0 || n>100)
 {

  printf("Invalid number. It must be brtween 1 to 100");
 }
 else
 {
  // logic for scanning the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("Enter element %d: ", i);
   scanf("%d",&no[i]);
  }

  
  // the logic for sorting the numbers
  for(i = 0 ; i < n ;i++)
  { 
   for(j = 0 ; j < n ; j++  ) 
   {

    if(no[i] > no[j])
    {
     // if the number at index i is greater than the number at index j then swap the numbers
     temp = no[i];

     no[i] = no[j];
     no[j] = temp;
    }
   }
  }

  for(i = 0 ; i < n ;i++)
  { 
   printf("\nnumber at index %d is %d ", i , no[i]);
  }
 }

 printf("\n");
}

scan n numbers and display them (using array)

/****************************
*  Umang B Bhatt       *
*   bhatt.umang7@gmail.com  *
*****************************/

/**
* program for scannign n numbers and displaying them
*/
#include<stdio.h>
void main()
{

 int n = 0 , i =0 ;

 int no[100];
 printf("How many numbers you want to scan ? ");
 scanf("%d",&n);

 if(n < 0 || n>100)
 {
  printf("Invalid number. It must be brtween 1 to 100");
 }

 else
 {
  // logic for scanning the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("Enter element %d: ", i);
   scanf("%d",&no[i]);
  }

  
  // the logic for displaying the numbers
  for(i = 0 ; i < n ;i++)
  {

   printf("\nnumber at index %d is %d ", i , no[i]);
  }
 }
 printf("\n");
}

pattern

A program that will generate above pattern:

#include<stdio.h>
// this program works well when the value of rows is less than 20
void main()
{

 int n = 5;
 int i = 0 , j = 0 , k = 0;

 int temp = 0 ;
 printf("Enter no of rows: ");

 scanf("%d",&n);
 temp = n;
 for(i = 0; i<n ;i++)
 {

  // logic for space
  for(k = 0 ; k < temp ; k++ )
  {

   printf("  ");
  }
  temp--;
  // for printing the actuak number
  for(j = 0; j <= i ; j++)
  {

   printf("%3d ", fun(i,j,n));
  }
  printf("\n");
 }
}

int fun(int a , int b, int n )
{

 int sum = 0 ;
 int i = 0 , j = 0;

 for(i = n-1 ; i >= 0 ; i--)
 {

  for(j = 0 ; j <= i ; j++)
  {

   sum++;
   if( i==a && b==j )
   {

    return sum;
   }
  }
 }
 return sum;
}

pattern

Question: Write a program that generates output shown in left image.

The code is:

#include<stdio.h>
// this program works well when the value of rows is less than 20
void main()
{

 int n = 5;
 int i = 0 , j = 0;

 printf("Enter no of rows: ");
 scanf("%d",&n);
 for(i = 0; i<n ;i++)
 {

  for(j = i; j >=0;j--)
  {

   printf("%3d ", fun(i,j));
  }
  printf("\n");
 }
}

int fun(int a , int b )
{
 int sum = 0 ;

 int i = 0 , j = 0;

 for(i = 0 ; i <= a ; i++)
 {

  for(j = 0 ; j <= i ; j++)
  {

   sum++;
   if( i==a && b==j )
   {

    return sum;
   }
  }
 }
 return sum;
}