Question

C Language

Write the code that dynamically allocates an array of struct objects based on a size entered through the command line arguments, You will use the following struct and enum. typedef enum Color { RED, GREEN, BLUE } Color; typedef struct MyStruct { int value; Color color; } MyStruct; Write the code to do the following: a. Check for one additional command line argument. Only proceed to the rest of the program if it exists and that the value can be converted to an Integer greater than zero. No error messages are needed. b. Dynamically allocate an array of MyStruct objects based on the size entered through the command line argument. C. Initialize all values in the array of MyStruct objects. value will be initialized to the index number in which that particular object exists in the array. For color, you can randomly assign a value in the enum. Each Color value has a 1 in 3 chance of being assigned. d. Traverse The array and only print out the value's which the color is RED. Assume that you are writing The code within a main () function that all necessary header files are included.

Answer 1

I have included my code and screenshots in this answer. In case, there is any indentation issue due to editor, then please refer to code screenshots to avoid confusion.

--------------Code for main.c-------------------------

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

typedef enum Color{RED, GREEN, BLUE} Color;

//struct MyStruct is declared
typedef struct MyStruct
{
   int value;
   Color color;
} MyStruct;

int main(int argc, char** argv)
{
   MyStruct *Arrayptr; //declare a pointer of type MyStruct, this pointer is used to access array
   int N;

   if(argc != 2)                       //if command line argument is not given exit
   {
       printf("\nGive additional command line argument\n");
       exit(1);
   }
   N = atoi(argv[1]);
   if(N <= 0) //if command line argument is not integer greater than 0, then exit
   {
       printf("\nGive additional command line argument as integer greater than 0\n");
       exit(1);
   }
   Arrayptr = (MyStruct*)malloc(N * sizeof(MyStruct)); //dynamically declare array of MyStruct of size N elements

   int i, r;
   Color enum_array[] = {RED, GREEN, BLUE};
   srand(time(0));
   for (i = 0; i < N; i++)                   //for each array element initialize
   {
       Arrayptr[i].value = i;         //initialize value to index of object
       r = rand()%3 + 1;                 //random number in range 0 to 3
       Arrayptr[i].color = enum_array[r]; //randomly select color and assign
   }

   printf("\nThe values for which color is RED: \n");
   for (i = 0; i < N; i++)
   {
       if(Arrayptr[i].color == RED) //for each array element if color value is RED then print its value
       {
           printf("%d ", Arrayptr[i].value);
       }
   }
   printf("\n\n");
   return 0;
}

--------------Screenshots for main.c-------------------------

-/c/enum_struct_cmdline_arg/main.c - Sublime Text (UNREGISTERED) 12:49 PM main.c { 18 { 20 { #include<stdio.h> 2 #include<stdlib.h> 3 #include<string.h> 4 #include <time.h> 5 6 typedef enum Color{RED, GREEN, BLUE} Color; 7 8 //struct MyStruct is declared 9 typedef struct MyStruct 10 11 int value; 12 Color color; 13 } MyStruct; 14 15 16 17 int main(int argc, char** argv) 19 MyStruct *Arrayptr; //declare a pointer of type MyStruct, this pointer is used to access array int N; 21 22 if(argc != 2) //if command line argument is not given exit 23 24 printf("\nGive additional command line argument\n"); 25 exit(1); 26 27 N = atoi(argv[i]); 28 if(N <= 0) //if command line argument is not integer greater than ©, then exit 29 30 printf("\nGive additional command line argument as integer greater than 0\n"); exit(1); 32 33 Arrayptr = (MyStruct*)malloc(N * sizeof(MyStruct)); //dynamically declare array of MyStruct of size N elements 34 35 int i, r; 36 Color enum_array[] = {RED, GREEN, BLUE}; 37 srand(time()); 38 for (i = 0; i < N; i++) //for each array element initialize 39 40 Arrayptr[i].value = i; //initialize value to index of object 41 r = rand()%3 + 1; //random number in range o to 3 42 Arrayptr[i].color = enum_array[r]; //randomly select color and assign 43 44 45 46 printf("\nThe values for which color is RED: \n"); 47 for (i = 0; i < N; i++) 48 49 f(Arrayptr[i].color == RED) //for each array element if color value is RED then print its value Line 50, Column 10 } { 31 } { } { Tab Size: 4 c

-/c/enum_struct_cmdline_arg/main.c - Sublime Text (UNREGISTERED) 12:49 PM main.c { 10 11 12 int value; Color color; } MyStruct; 15 16 17 18 19 20 { int main(int argc, char** argv) MyStruct *Arrayptr; int N; //declare a pointer of type MyStruct, this pointer is used to access array if(argc != 2) //if command line argument is not given exit printf("\nGive additional command line argument\n"); exit(1); { N = atoi (argv[i]); if(N <= 0) //if command line argument is not integer greater than o, then exit printf("\nGive additional command line argument as integer greater than 0\n"); exit(1); Arrayptr = (MyStruct*)malloc(N * sizeof(MyStruct)); //dynamically declare array of MyStruct of size N elements int i, r; Color enum_array[] = {RED, GREEN, BLUE}; srand(time()); for (i = 0; i<N; i++) //for each array element initialize Arrayptr[i].value = i; //initialize value to index of object r = rand()%3 + 1; //random_number in range o to 3 Arrayptr[i].color = enum_array[r]; //randomly select color and assign 39 { } 41 42 43 44 45 46 47 48 49 50 printf("\nThe values for which color is RED: \n"); for (i = 0; i < N; i++) if(Arrayptr[i].color == RED) //for each array element if color value is RED then print its value printf("%d ", Arrayptr[i].value); { । } 53 54 55 56 } printf("\n\n"); return 0; Line 50, Column 10 Tab Size: 4

--------------Output for main.c-------------------------

) 12:49 PM vs@ubuntu: -/c/enum_struct_cmdline_arg vs@ubuntu:-/c/enum_struct_cmdline_args gcc main.c vs@ubuntu:-/c/enum_struct_cmdline_arg$ ./a.out -12 Give additional command line argument as integer greater than o vs@ubuntu:-/c/enum_struct_cmdline_args ./a.out Give additional command line argument vs@ubuntu:-/c/enum_struct_cmdline_arg$ ./a.out 10 The values for which color is RED: 0 1 9 vs@ubuntu:-/c/enum_struct_cmdline_arg$ ./a.out 20 The values for which color is RED: 2 11 13 14 vs@ubuntu:-/c/enum_struct_cmdline_args /a.out 20 The values for which color is RED: 05 6 12 15 18 vs@ubuntu:-/c/enum_struct_cmdline_args ./a.out 20 s The values for which color is RED: 3 5 9 13 17 vs@ubuntu:-/c/enum_struct_cmdline_args I

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