[c language] PTA 7-55 query fruit price

Given four fruits , They are apples （apple）、 pear （pear）、 orange （orange）、 grapes （grape）, The unit price corresponds to 3.00 element / kg 、2.50 element / kg 、4.10 element / kg 、10.20 element / kg .

First, display the following menu on the screen ：

[1] apple
[2] pear
[3] orange
[4] grape
[0] exit

The user can enter the number 1~4 Query the unit price of the corresponding fruit . When the number of consecutive queries exceeds 5 When the time , The program should exit the query automatically ; Less than 5 And then the user enters 0 Quit immediately ; Enter another number , Show price as 0.

Input format :

Enter a number of numbers in a row that the user has entered in succession .

Output format :

First, show the menu on the screen . Then corresponding to each input of the user , In one line by format “price = Price ” Output query results , Two decimal places are reserved for the price . When the number of continuous queries exceeds 5 Time 、 Or active input 0 when , Program end .

sample input 1:

3 -1 0 2

No blank lines at the end

sample output 1:

[1] apple
[2] pear
[3] orange
[4] grape
[0] exit
price = 4.10
price = 0.00

No blank lines at the end

sample input 2:

1 2 3 3 4 4 5 6 7 8

sample output 2:

[1] apple
[2] pear
[3] orange
[4] grape
[0] exit
price = 3.00
price = 2.50
price = 4.10
price = 4.10
price = 10.20

Their thinking ： Use an array to store the input number , After saving, read and output the corresponding price in sequence .

         I originally wanted to store the corresponding price with another data , But considering that there will be other serial numbers in the input , If the sequence number entered is larger than the size of the array or negative, it may cause an error , And it is known that the entered serial numbers are all integers , Final replacement switch case sentence .

The code is as follows ： 

#include<stdio.h>
int main(){
	//float a[5]={0,3.0,2.5,4.1,10.2};
	int s[5]={0,};
	int i=0;
	int n;
	
	 
	while(i<5){
		scanf("%d",&n);
		if(n==0){
		break;
		} 
		s[i]=n;
		i++;		 
	}
	printf("[1] apple\n[2] pear\n[3] orange\n[4] grape\n[0] exit");
	
	int N=i;
	
	for(i=0;i<N;i++){
		printf("\nprice = ");
		switch (s[i]){
			case 1:
				printf("%.2f",3.0);
				break;
			case 2:
				printf("%.2f",2.5);
				break;
			case 3:
				printf("%.2f",4.1);
				break;
			case 4:
				printf("%.2f",10.2);
				break;
			default:
				printf("%.2f",0.0);
				break;
		}
	}
	
}