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因为输入个数未知，因此应该先准备一个足够大的整型数组；
然后利用循环进行输入，判断条件即为是否输入换行符。
PAT题集《浙大版<C语言程序设计（第3版）>题目集》练习3-8 查询水果价格 (15 分)答案：
#include<stdio.h> int main() { int choices[20]; int i = 0; do
{ scanf("%d", &choices[i]); i++; } while (getchar() !=
'\n'); printf("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit\n");
for (int j = 0; j<5; j++) { if (choices[j] == 0)
break; else { switch (choices[j])
{ case 1:printf("price = 3.00\n"); break;
case 2:printf("price = 2.50\n"); break; case
3:printf("price = 4.10\n"); break; case 4:printf("price =
10.20\n"); break; default:printf("price = 0.00\n");break;
} } } return 0; }
