Question

Cloud computing uses the internet and central remote servers to maintain data and applications. It is essentially a resource delivery and usage model to get infrastructure, platforms, and software through the internet. A cloud provider supplies a pool of resources to consumers. On-demand instances are paid by the hour with no long-term commitments. Reserved instances allow the consumer to make a one-time payment for each instance reserved and receive a significant discount on the hourly usage charge.

The pricing structure of a cloud provider that provides on-demand instances is stored in a data file (price.txt). Each line of the data file contains the instance ID, memory, computing capacity, and prices in the Windows environment, in that order. The file is space delimited and contains a control number.

ASSIGNMENT: Write a C program to read the pricing structure from the data file. Since you are interested in services providing between 1 and 20 GB of memory, print the instance ID, memory, computing capacity, and price in $/hr for the instances which have between 1 and 20 GB of memory. For all other instances, print the instance ID followed by a message (memory is either too high or too low). Print the table to the computer screen and to an output file called screened.txt.

Use the “Code Sections.c” template on Blackboard to write your code.

Your program output will look like the illustration shown below. Use your PC’s cursor to determine the horizontal and vertical spacing for the output format.

SAMPLE OUTPUT FORMAT:

********************************************

CLOUD COMPUTING PRICES

Instance Memory Computing Price

ID (GB) Capacity (GB) ($/h)

x xx.x xx x.xx

x      ** Memory is too large **

   x      ** Memory is too small **

** ********************************************

10
1 1.7 1 0.11
2 7.5 4 .48
3 15 8 .94
4 0.5 2 .03
5 1.7 5 .62
6 6.5 10 1.22
7 17.1 6 .64
8 34.6 12 1.20
9 69.5 24 2.56
10 20 32 1.98

Answer 1

Program Screenshot:

Sample Output:

Note: I have done the formatting as per the question. If some specific formatting is required, do tell.

Program code to copy:

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

// main function
int main()
{
// structure pointer variable is declared of type struct FILE
FILE *fin, *fout;
// variables are declared
int n;
int instanceID, computingCap;
float memory, price;
  
// files are opened for reading and writing
fin = fopen("price.txt","r");
fout = fopen("screened.txt", "w");
  
// error catching
if(fin == NULL){
printf("Error opening file price.txt\n");
exit(1);
}
// error catching
if(fout == NULL){
printf("Error opening file screened.txt\n");
exit(1);
}
  
// reading first line of file "price.txt"
fscanf(fin, "%d\n", &n);
// strings that are used for output formatting
char str1[] = "********************************************\n";
char str2[] = "CLOUD COMPUTING PRICES\n";
char str3[] = "Instance Memory Computing Price\nID (GB) Capacity (GB) ($/h)\n";
printf("%s%s%s", str1, str2, str3);
fprintf(fout, "%s%s%s", str1, str2, str3);
  
// while loop to read in the input and write to another file
while(fscanf(fin,"%d %f %d %f\n", &instanceID, &memory,
&computingCap, &price) != EOF){
// if memory too small
if(memory < 1.0){
printf("%d ** Memory is too small **\n",instanceID);
fprintf(fout, "%d ** Memory is too small **\n",instanceID);
}
// if memory too large
else if (memory > 20.0){
printf("%d ** Memory is too large **\n",instanceID);
fprintf(fout, "%d ** Memory is too small **\n",instanceID);
}
// if memory is perfect
else{
printf("%d %.1f %d %.2f\n", instanceID, memory, computingCap, price);
fprintf(fout, "%d %.1f %d %.2f\n", instanceID, memory, computingCap, price);
}
}
// printing out output format
printf("%s",str1);
fprintf(fout, "%s", str1);
  
// closing the files
fclose(fin);
fclose(fout);
// returning 0
return 0;
}