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cv2/program.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define LINE_LEN 100
+#define LIST_SIZE 128
+typedef struct {
+    char name[LINE_LEN];
+    float price;
+} pizza;
+int get_line(char *name);
+int get_pizza(pizza *p_item);
+int compare_pizza(const void* pVoid1, const void* pVoid2);
+int main() {
+    pizza items[LIST_SIZE];
+    memset(items,0,sizeof(items));
+    int count = 0;
+    while(get_pizza(items + count)) {
+        count++;
+    }
+    qsort(items, count, sizeof(pizza), compare_pizza);
+    int i = 0;
+    while(i < count) {
+        printf("%s\n%f\n", items[i].name, items[i].price);
+        i++;
+    }
+    return 0;
+}
+int get_line(char *name)
+{
+    memset(name, 0, LINE_LEN);
+    char* r = fgets(name, LINE_LEN, stdin);
+    if (r == NULL || name[1] == 0) {
+        return 0;
+    }
+    int n = strlen(name);
+    if (name[n - 1] == '\n')
+        name[n - 1] = 0;
+    return 1;
+}
+int get_pizza(pizza *p_item)
+{
+    int res = get_line(p_item->name);
+    char price_string[LINE_LEN];
+    res += get_line(price_string);
+    if (res != 2) return 0;
+    sscanf(price_string, "%f", &(p_item->price));
+    if(p_item->price == 0.) return 0;
+    return 1;
+}
+int compare_pizza(const void* pVoid1, const void* pVoid2) {
+    pizza* pPizza1 = (pizza*) pVoid1;
+    float price1 = pPizza1->price;
+    pizza* pPizza2 = (pizza*) pVoid2;
+    float price2 = pPizza2->price;
+    float r = price1 - price2;
+    if (r > 0.) return 1;
+    if (r < 0.) return -1;
+    if (r == 0.) return 0;
+}