C Exercises: Allocate a block of memory for an array
C Variable Type : Exercise-11 with Solution
Write a C program to allocate a block of memory for an array.
Sample Solution:
C Code:
#include<stdio.h> // Include the standard input/output header file.
#include<stdlib.h> // Include the standard library header file.
int main () // Start of the main function.
{
int i, n, num; // Declare integer variables 'i', 'n', and 'num'.
int * my_array; // Declare a pointer to int 'my_array'.
printf("\nInput the number of elements to be stored in the array :"); // Prompt the user to input the number of elements.
scanf("%d",&n); // Read the user's input and store it in 'n'.
printf("Input %d elements in the array :\n",n); // Prompt the user to input the elements of the array.
my_array = (int*) calloc( n,sizeof(int) ); // Allocate memory for 'n' integers and assign the pointer to 'my_array'.
if (my_array==NULL) // Check if memory allocation was successful.
{
printf (" Requested memory allocation is wrong."); // Print an error message if memory allocation failed.
exit (1); // Exit the program with an error code.
}
for ( i=0; i<n; i++ ) // Start of a for loop to iterate over the elements of the array.
{
printf (" element %d : ",i+1); // Prompt the user for the value of the current element.
scanf ("%d",&my_array[i]); // Read the user's input and store it in the current element of 'my_array'.
}
printf (" Values entered in the array are : \n"); // Print a message indicating the values in the array.
for ( i=0; i<n; i++ ) // Start of a for loop to iterate over the elements of the array.
printf (" %d ",my_array[i]); // Print the current element of the array.
printf ("\n\n"); // Print two newline characters for formatting.
free (my_array); // Free the allocated memory for 'my_array'.
return 0; // Return 0 to indicate successful execution of the program.
} // End of the main function.
Sample Output:
Input the number of elements to be stored in the array :5 Input 5 elements in the array : element 1 : 5 element 2 : 10 element 3 : 15 element 4 : 20 element 5 : 25 Values entered in the array are : 5 10 15 20 25
Flowchart:

C Programming Code Editor:
Previous: Write a C program to find the quotient and remainder of a division.
Next: Write a C program to perform a binary search in an array.
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