Question

Hi the programming language for this assignment is C programming. Could you also please number the answers exactly as they appear in the assignment? Thank you.

(9) 1. An array of structures is needed to keep track of 50 grocery items containing the item name, item type, cost, quantity, and tax percentage for each grocery item. The following declarations have already been done: { struct grocery char name[20], type[15]: float cost, taxp: int quan: 3 Also, the following declaration has been done in the main: grocery g(50): a. Write a program fragment to load the array of structures from a text file called ITEMS.TXT. Assume that for each grocery item, the first line of the text file only contains the item name, the second line of the text file contains only the item type, and the third line of the text file contains the cost, quantity, and tax percentage. No declarations or functions are needed. b. Sort the structures on the cost data member in DESCENDING order. No declarations, functions, or print routine are needed c. Save your structure to the binary file ITEMS.BIN. No declarations or functions are needed. PAGE 1 OF 3

Answer 1

Find the source code below. I have tested the code so i have provided lines for printing for testing purpose as well.They are commented out. Uncomment and you see result.Comment if any doubt.

Note - Create input file ITEMS.txt and place it in same folder. See screenshot.

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

typedef struct grocery{
char name[20],type[15];
float cost,taxp;
int quan;
}grocery;
int main(void) {
grocery g[50];

/************part a ***************/
FILE* file;
if((file=fopen("ITEMS.txt","r"))==NULL){
    printf("Error in opening file");
    exit(1);
}
int count=0;
while(
    fscanf(file,"%s %s %f %d %f",g[count].name,g[count].type,&g[count].cost,&g[count].quan,&g[count].taxp)!=EOF){
    //printf("%s|%s|%f|%d|%f\n",g[count].name,g[count].type,g[count].cost,g[count].quan,g[count].taxp);
    count++;
}

/************part b ***************/
//sort
int i;
for(i=1;i<count;i++){
    int j=1;
    while(j>=1 && g[j].cost>g[j-1].cost){
      grocery temp=g[j-1];
      g[j-1]=g[j];
      g[j]=temp;
    }
}
/*
//print sorted list
printf("printing sorted list\n");
for(i=0;i<count;i++){
    printf("%s|%s|%f|%d|%f\n",g[i].name,g[i].type,g[i].cost,g[i].quan,g[i].taxp);
}*/

/*********part c**********/
FILE* fw;
if((fw=fopen("ITEMS.bin","w"))==NULL){
    printf("can not open file to write");
}
fwrite(g,sizeof(grocery),count,fw);
grocery f[50];
fclose(fw);
/*printf("read from file\n");
FILE* fr=fopen("ITEMS.bin","r");
fread(f,sizeof(grocery),count,fr);
for(i=0;i<count;i++){
    printf("%s|%s|%f|%d|%f\n",f[i].name,f[i].type,f[i].cost,f[i].quan,f[i].taxp);
}*/

return 0;
}

==================================Sample input file=====

ITEMS.txt

Apple
Fruit
12.34 12 10.5
Milk
Drinks
24 2 5

=======================================

Files clang-7 -pthread -lm -o main main.c ./main с main.c L ITEMS.bin L ITEMS.txt } main.c saved 5 char name[20], type[15]; 6 float cost, taxp; 7 int quan; 8 }grocery; 9 int main(void) { 10 grocery g[50]; 11 FILE* file; 12 if((file=fopen("ITEMS.txt","r")) ==NULL) { 13 printf("Error in opening file"); 14 exit(1); 15 16 int count=0; 17 while 18 fscanf(file, "%s %s %f %d %f",g[count].name, g[count].type, &g [count].cost,&g[count].quan, &g[count].taxp)!=EOF) { 19 //printf("%s %s %f%d %f\n",g[count].name,g[count].type, g[count] .cost,g[count].quan,g[count].taxp); 20 count++; 21 } 22 //sort 23 int i; 24 for(i=1;i<count;i++) { 25 int j=1; 26 while(j>=1 && g[j].cost>g[j-1].cost){ 27 grocery temp=g[j-1]; 28 g[j-1]=g[j]; 29 g[j]=temp; 30 } 31 22