Question

Explain the following code, line by line. As well as the is going on over all.

#include <stdio.h>

int main() {

  int a[30];

  int i,j,lasti;

  int num;

  

  lasti=0;

  // scanf the number

  scanf("%d",&a[0]);

  while (1)

  {

  // sacnf the new number

  printf("Enter another Number \n");

  scanf("%d",&num);

  for(i=0;i<=lasti;i=i+1)

  {

  printf("%d \n",a[i]);

  // we check if the num that we eneterd is greter than i

  if(a[i] > num)

  {

  for(j=lasti; j>= i;j--)

  {

  a[j+1]=a[j];

  }

  

  a[i]=num;

  lasti++;

  break;

  }

  }

  if(i>lasti)

  {

  a[i]=num;

  lasti++;

  }

  

  for(i=0;i<=lasti;i++)

  {

  

  printf(" %d\n",a[i]);

  }

  }

}

Answer 1

#include<stdio.h> // Standard C library header, defines various functions for performing input and output

int main()

{

  int a[30]; // declaration of array variable of size 30.

  int i,j,lasti; // declaration of integer variables

  int num; // declaration of integer variable

lasti=0; //Initializing integer variable to 0

// scan the number

scanf("%d",&a[0])

while (1) // looping until break.
{
// sacnf the new number
printf("Enter another Number \n");
scanf("%d",&num); // reading another number
for(i=0;i<=lasti;i=i+1) // looping 0 to last number in array a[]
{
printf("%d \n",a[i]); //printing array elements
// we check if the num that we eneterd is greter than i
if(a[i] > num) // comparing ith element with given number entered
{
for(j=lasti; j>= i;j--) // looping from last element to ith element.
{
a[j+1]=a[j]; //swaping grater number to next position to sort array
}
a[i]=num; // acutal assingin of given number
lasti++; // incrementing lasti value
break;
}
}
if(i>lasti) // this condition fails if above for loop is terminated by break
{
a[i]=num; // else assigning ith element with given number
lasti++; // incrementing lasti value
}
  
for(i=0;i<=lasti;i++) // loop for printing sorted array in assendign order.
{
  
printf(" %d\n",a[i]); // prining ith element

}

}

}

Smaple output:

Entered 10 as first number array, it promted for another number given 20, it printed the number 10 which in array and internally it added 20 to array and printed 10 and 20 as elements in array and prompted for another number. gave 30 as input, it printed 10 20 as the elements already in array and internally it added 30 to array and printed 10, 20 and 30 as elements in array and promte for another soon upto 50.

if in case we enter number which is less than any number in existing array, the initail printing of number in array is limit till it encounters the greater number than given new nubmer as illustrated below.

Enter another Number 25 10 20 30 10 20 25 30 40 50 Enter another Number

if we give 25 now, it will print till the nearest nubmer grater than given number and then it swaps all greater number to create gap for 25 and place the 25 in currect position to make the array sorted in assending order. and prints total array.