112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define LINE_SIZE 100
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#define LIST_SIZE 100
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struct pizza
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{
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char name[LINE_SIZE];
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float prize;
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};
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int read_item(struct pizza *item)
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{
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char name_buffer[100];
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char price_buffer[20];
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if (fgets(name_buffer, sizeof(name_buffer), stdin) == NULL)
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{
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return 0;
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}
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size_t len = strlen(name_buffer);
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if (len > 0 && name_buffer[len-1] == '\n')
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{
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name_buffer[len-1] = '\0';
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}
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if (strlen(name_buffer)==0)
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{
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return 0;
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}
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if (fgets(price_buffer, sizeof(price_buffer), stdin)==NULL)
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{
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return 0;
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}
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float prize;
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if (sscanf(price_buffer, "%f", &prize)!=1)
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{
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return 0;
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}
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if (prize<=0)
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{
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return 0;
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}
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strcpy(item->name, name_buffer);
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item->prize=prize;
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return 1;
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}
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int read_pizza_list(struct pizza* list)
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{
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int counter=0;
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for (int i=0; i< LIST_SIZE; i++)
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{
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struct pizza item;
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memset(&item,0,sizeof(struct pizza));
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int r=read_item(&item);
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if (r)
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{
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memcpy(&list[i],&item,sizeof(struct pizza));
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counter+=1;
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}
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else
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{
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break;
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}
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}
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return counter;
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}
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int compare (const void * a, const void * b)
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{
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const struct pizza* pizza_a=a;
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const float prize_a=pizza_a->prize;
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const char* name_a=pizza_a->name;
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const struct pizza* pizza_b=b;
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const float prize_b=pizza_b->prize;
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const char* name_b=pizza_b->name;
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float r=prize_a-prize_b;
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if (r>0)
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{
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return 1;
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}
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else if (r<0)
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{
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return -1;
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}
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else
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{
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int r2=strcmp(name_a,name_b);
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if (r2>0)
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{
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return 1;
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}
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else if (r2<0)
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{
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return 1;
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}
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}
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return 0;
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}
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int main ()
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{
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struct pizza list[LIST_SIZE];
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memset(list,0,LIST_SIZE*sizeof(struct pizza));
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int count=read_pizza_list(list);
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qsort(list, count, sizeof(struct pizza), compare);
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for (size_t i = 0; i < count; i++)
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{
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printf("%s\n %f", list[i].name, list[i].prize);
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}
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}
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