Write a program that will read in id numbers and place them in an array. The array is dynamically allocated large enough to hold the number of id numbers given by the user. The program will then input an id and call a function to search for that id in the array. It will print whether the id is in the array or not.

#include <stdio.h>

#include <stdlib.h>

int main() {

  int n, i, *p, s;

  scanf("%d", n);

  p = (int*) malloc(n * sizeof(int));

  if(p == NULL) {

     printf("\nError! memory not allocated.");

     exit(0);

  }

  printf("\nEnter elements of array : ");

  for(i = 0; i < n; ++i) {

     scanf("%d", p + i);  

  }

  scanf("Enter Id to be searched: %d", s);

  for(j = 0; j < n; ++j) {

     if (s == *(p+j)){

         printf("ID number is in the array at position %d", j);

     }else{

         printf("Error: ID number does not exist.");

     }  

  }

  return 0;

Explanation:

The C program source code inputs integer values to dynamic array size, and the search variable is looked for in the array using a for loop. If the search term exists, then the index position is printed on the screen, else an error message is displayed on the screen.