Question

Element Shifter: Write a function that accepts an int array and the array’s size as arguments. The function should create a new array that is one element larger than the argument array. The first element of the new array should be set to 0. Element 0 of the argument array should be copied to element 1 of the new array, element 1 of the argument array should be copied to element 2 of the new array, and so forth. The function should return a pointer to the new array. Demonstrate the function by using it in a main program that reads an integer N (that is not more than 50) from standard input and then reads N integers from a file named data into an array. The program then passes the array to your element shifter function, and prints the values of the new expanded and shifted array on standard output, one value per line. You may assume that the file data has at least N values. Prompts And Output Labels. There are no prompts for the integer and no labels for the reversed array that is printed out. Input Validation. If the integer read in from standard input exceeds 50 or is less than 0 the program terminates silently.

Answer 1

C Program:

#include <stdio.h>

//Element Shifter function
int* elementShift(int *arr, int N)
{
int *arr1;
int i;
  
//Allocating memory
arr1 = (int *)malloc(sizeof(int)*(N+1));
  
//Storing 0 as first element
*arr1 = 0;
  
//Copying elements
for(i=0; i<N; i++)
{
*(arr1+i+1) = *(arr+i);
}
  
return arr1;
}

//Main function
int main(int argc, char **argv)
{
int N, i;
int *arr1, *arr2;
FILE *fp;
  
//Reading N value
scanf("%d", &N);
  
//Checking N value
if(N<0 || N>50)
{
return 0;
}
  
//Allocating memory for array 1
arr1 = (int *)malloc(sizeof(int) * N);
  
//Opening file
fp = fopen("D:\\data.txt","r");
  
//Reading N values from file
for(i=0; i<N; i++)
{
fscanf(fp, "%d", &arr1[i]);
}
  
//Closing file
fclose(fp);
  
//Calling Element Shifter function
arr2 = elementShift(arr1, N);
  
//Printing elements
for(i=0; i<N+1; i++)
{
printf("\n%d",*(arr2+i));
}
  
printf("\n");
return 0;
}
__________________________________________________________________________________________________________________

Sample Run: