usaa21/cv2/program.c

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



#define SIZE 100
#define NAMESIZE 50


struct menu {
	char name[SIZE];
	float price;
};

// function to compare names alphabetically
int compare_name(const void* c1, const void* c2);

// function to compare floats
int compare_float(const void* c1, const void* c2);




int main(){
	
	
	
	struct menu food_database[SIZE];
	memset(food_database, 0, SIZE*sizeof(struct menu));


	
	int meal_counter = 0;
	char temp[20];
	char* ptr1 = NULL;
	char* ptr2 = NULL;
	while(1){
		// load name into struct
		ptr1 = fgets(food_database[meal_counter].name, NAMESIZE, stdin);
		if ( ptr1 == NULL ){
			break;
		}		
		// load price into struct
		ptr2 = fgets(temp, 20, stdin);
		food_database[meal_counter].price = strtof(temp, NULL);	
		if ( ptr2 == NULL || food_database[meal_counter].price == 0){
			break;
		}
		meal_counter++;
	}			
	// first sort by name, then by price
	qsort(food_database,meal_counter,sizeof(struct menu),compare_name);
	qsort(food_database,meal_counter,sizeof(struct menu),compare_float);
	// print results
	for(int i=0; i<meal_counter; i++){
		printf("%s",food_database[i].name); 
		printf("%f\n",food_database[i].price);

	}

return 0;
}


int compare_float(const void* c1, const void* c2){
	struct menu* p1 = (struct menu* ) c1;
	struct menu* p2 = (struct menu* ) c2;
	if( p1->price > p2->price ){
		return 1;
	}else if( p1->price < p2->price ){
		return -1;
	}else{
		return 0;
	}
		
}

int compare_name(const void* c1, const void* c2){
	struct menu* p1 = (struct menu* ) c1;
	struct menu* p2 = (struct menu* ) c2;			
	return strcmp(p1->name,p2->name);

}