%f，它停止并返回0。您应该检查返回值。使用int result=scanf_s（“%f”、&priceoferange）。之后，如果result不是1，则向用户打印一条消息，扫描输入，直到看到换行符（刷新用户键入的行），然后重试。同时停止使用浮动价格。它

---

%f

，它停止并返回0。您应该检查返回值。使用

int result=scanf_s（“%f”、&priceoferange）。之后，如果
result
不是1，则向用户打印一条消息，扫描输入，直到看到换行符（刷新用户键入的行），然后重试。同时停止使用浮动价格。它不仅会受到$1.1的影响，而且无法存储$123456789这样的值，因为它只有~7位精度（假设IEEE-754）注释不用于扩展讨论；此对话已结束。评论不用于扩展讨论；这段对话已经结束。
if(priceoforange == .){
        printf("Failure);
    }

float priceoforange;

printf("\nWhat would you like the cost of orange to be?  %c", ch); 

scanf_s(" %f", &priceoforange);

#include<stdio.h>

int main()
{
    float priceoforange, priceofapple, priceofpear, budget;
    int choice; //Customer choses what item he wants to buy
    char ch = 156; 
    
    printf("--------|Shop Owner Section|--------\n");
    printf("Current items in shop are 1-orange, 2-apple and 3-pear\n");

    printf("\nWhat would you like the cost of orange to be?  %c", ch); 
    scanf_s(" %f", &priceoforange); //sets the cost of orange to input
    printf("What would you like the cost of apple to be?   %c", ch);
    scanf_s(" %f", &priceofapple);

    printf("What would you like the cost of pear to be?    %c", ch);
    scanf_s(" %f", &priceofpear);
    

    printf("-----|End of Shop Owner Section|----\n");
    printf("\nWelcome to the fruit shop\n");
    printf("\n------|Shop Menu|------\n");
    printf("Item prefixes-    cost\n1- Orange         %c%.2f\n2- Apple          %c%.2f\n3- Pear           %c%.2f\n", ch, priceoforange, ch, priceofapple, ch, priceofpear);

    printf("\nHello, how much would you like to spend today?\n%c", ch);
    scanf_s(" %f", &budget);

    printf("\nYour budget for today is %c%.2f\n", ch, budget);
    printf("What would you like to buy please select 1 , 2 or 3 from shop menu\n");

    scanf_s(" %d", &choice);

    if ((choice == 1) && (priceoforange <= budget)){
        printf("Success you have purchased orange for %c%.2f", ch, priceoforange);
        return(0);
    }
    else if((choice == 2) && (priceofapple <= budget)){
        printf("Success you have purchased Apple for %c%.2f", ch, priceofapple);
        return(0);
    }
    else if ((choice == 3) && (priceofpear <= budget)){
        printf("Success you have purchased Pear for %c%.2f", ch, priceofpear);
        return(0);
    }
    else if ((choice < 4) && (priceoforange || priceofapple || priceofpear > budget)) {
        printf("\n*****-|Failure you cant make the purchase you have %c%.2f|-*****\n\n", ch, budget);
        return(0);
    }
    else {
        printf("\n***** -|Failure you have inputted incorrect information|- *****\n\n");
    }
    return(0);
}