Question

Can anyone help me with my C hw?

Exercise 3 You will write a new program that combines dynamically allocating an array and saving that array to a file. These are the tasks your program must perform Open an output file named "data.txt" and prepare it for writing in text mode o If the file handle is NULL, quit the program o By default, it is created and stored in the same directory as your source code file Prompt the user to enter an integerN between 1 and 100 (inclusive) . o If the value is less than one, then set N to 1 o If greater than 100, then setNto 100 Dynamically create an array of sizeNthat contains integer values. o You may use either the calloc or malloc function. Using a loop, assign a random integer value (from -100 to +100) to each element in the array o Utilize the srand and rand functions. After the array has been initialized, use another loop to write the array values to the file o Each line in the output file should be one element from the array. Free the allocated array, close the file, and exit the program. Run and test your program. Look at the generated output file to verify that it works. Note: It is also possible to useC99's variable length array (VLA) feature to create an array whose size is determined at run-time. However, the maximum VLA size is limited by the amount of stack memory available, which is usually much less than the heap memorvused by calloc or malloc. Sample Run Enter the desired size of the dynamic array: 5 Contents of the generated output file "data.txt" (your results will vary): 59 34 -69 -62

Answer 1

#include <stdio.h>
#include <stdlib.h>

void main()
{
FILE *fp;
int *arr, n, i;

/* Open an output file in write mode */
fp = fopen("data.txt", "w");

/* If file handle 'fp' is NULL, it will quit the program */
if( fp == NULL )
{
printf("File can not openes\n");
exit(1);
}

/* Taking input the value of 'N' from the user */
printf("Enter the desired size of the dynamic array:");
scanf("%d", &n);

if(n < 1)
n = 1; /* when 'n' is less than 1 */
else
if(n > 100)
n = 100; /* when 'n' is greater than 100 */

/* Dynamically creating an array of size 'n' */
arr = (int*) malloc(n * sizeof(int));

/* Assign a random integer value from -100 to +100 */
for (i = 0; i < n; i++)
*(arr+i) = (rand() % 201) - 100;

/* Writing the array values to the file */
for (i = 0; i < n; i++)
fprintf(fp,"%d\n", *(arr+i));

/* free allocated array */
free(arr);

/* Close the file */
fclose(fp);
}

After executing the program the content of "data.txt" file:

-59
76
3
69
-26
-54
-79
-88
-72
43