usaa19cv3/program.c

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

#define LINE_SIZE 100
#define LIST_SIZE 20

struct pizza{
   char name[LINE_SIZE];
   float prize;
};

int read_item(struct pizza* item);
int read_pizza_list(struct pizza* list);

int compare_pizza(const void * left, const void * right) {
    const struct pizza * a = (const struct pizza *) left;
    const struct pizza * b = (const struct pizza *) right;
    if (a->prize > b->prize){
        return 1;
    } 
    else if (a->prize < b->prize){
        return -1;
    } 
    else{
        return 0;
    }
}


int main(int argc, char *argv[]) {

	struct pizza list[LIST_SIZE];
	memset(list,0,LIST_SIZE*sizeof(struct pizza));

	int counter = 0;
	for (int i=0; i< LIST_SIZE; i++){
	    struct pizza item;
	    memset(&item,0,sizeof(struct pizza));
	    // Nacitajte polozku do pomocnej premennej
	    // Na nacitanie pouzite vlastny kod
	    int r = read_item(&item);
	    if (r){
	        // Ak sa nacitanie podarilo, skopirujte polozku do pola
	        memcpy(&list[i],&item,sizeof(struct pizza));
	    // Spocitame uspesne nacitane polozky
	    counter += 1;
	    }
	    else{
	        // Ak sa nacitanie nepodarilo, nasli sme poslednu polozku
	    // Prerusim nacitanie
	        break;
	    }
	}
	qsort (list, counter, sizeof(struct pizza), compare_pizza);
	int i=0;
	for (i = 0; i < counter; i++) {
        printf("%s%.6f\n", list[i].name, list[i].prize);
    }

    return 0;


}

int read_item(struct pizza* item){
	
	char line[LINE_SIZE];
	char line2[LINE_SIZE];
	memset(line,0,LINE_SIZE);
	memset(line2,0,LINE_SIZE);
	while (1){
		char *r = fgets(line,LINE_SIZE,stdin);
		if(r != NULL && line[1] != 0){
			int i=0;
			//printf("%s",line);
			while(line[i]!='\n' || line[i]!='\r'){
				if(line[i]=='\n'){
					//printf("Koniec n riadku\n");
					break;
				}
				else if(line[i]=='\r'){
					//printf("Koniec r riadku\n");
					break;
				}
				else if((line[i]>='a' && line[i]<='z') || (line[i]>='A' && line[i]<='Z') || line[i]==' '){
					//printf("%c\n",line[i]);
					i++;
				}
				else{
					//printf("NeplatnĂ˝ znak %c\n",line[i]);
					return 0;
				}
			}
			i=0;
		    char *r2 = fgets(line2,LINE_SIZE,stdin);
		    if(r2 != NULL && line2[1] != 0){
		    	int i=0;
		    	int comma=0;
		    	int comma_number=0;
				//printf("%s",line);
				while(line2[i]!='\n' || line2[i]!='\r' || line2[i]!='\0'){
					if(line2[i]=='\n'){
						//printf("Koniec n riadku\n");
						break;
					}
					else if(line2[i]=='\r'){
						//printf("Koniec r riadku\n");
						break;
					}
					else if(line2[i]=='\0'){
						//printf("Koniec r riadku\n");
						break;
					}
					else if((line2[i]>='0' && line2[i]<='9') || line2[i]=='.'){
						//printf("%c\n",line[i]);
						if(line2[i]=='.'){
							comma++;
						}
						if(line2[i]!='.' && comma){
							comma_number++;
						}
						i++;
					}
					else{
						//printf("NeplatnĂ˝ znak %c\n",line[i]);
						return 0;
					}
				}
				i=0;
				//printf("Comma %d\n",comma);
				//printf("Comma number %d\n",comma_number);
				if(comma!=1)return 0;
				if(comma_number!=2)return 0;
				float value = strtof(line2,NULL);
				if (value == 0.0F){
				   return 0;
				}
				item->prize = value;
				strcpy(item->name, line);
				return 1;
			}
			else{
				return 0;	
			}
		}
		else{
		    return 0;
		}
	}
}