c - 如何将相同的变量添加到自身？

Question

我正在尝试在 C 中向其自身添加一个变量。我必须解决的问题需要我询问用户 X 发生在 Y 上多少次。简单的例子:每次有人喝果汁(x)时，我需要反复添加果汁量(y)。这是我到目前为止的计划。据我所知，我所做的一切都按照预期进行，除了最后一段代码，我需要弄清楚哪些代码需要在“if”语句之前。预先感谢您的帮助。

#include <stdio.h>
int main(){
int a=1;
int b=1;
int i;
float dollars;
float size;
float price;//per ounceprice
float wieght;
int drinks;//times roommate took some juice
int c=0;
int sips;
int total;
int totalowed;
int loopCounter;
int sipstotal;
//.06 per ounce
float juiceTaken;
float juiceTakenCost;
float juiceTakenTotal;
float costperounce=.06;

while(a=b){
    printf("What is the weight (in oz.) of the original container of OJ?\n\n");
    scanf("%f", &wieght);

    printf("What is the cost of the original container of OJ in dollars?\n\n");
    scanf("%f", &dollars);
    price=dollars/wieght;
    printf("%f\n\n", price);

    printf("How many times did your roomate take your juice?\n\n");
    scanf("%d", &drinks);


        for(loopCounter = 0; loopCounter < drinks; loopCounter++){//repeat next line until loop equals amount of times roomate took juice
        printf("How much juice did your roommate take this time?\n\n");
        scanf("%d", &juiceTaken);
            if(juiceTakenTotal>=10)
            printf("Your roomate owes you $%.2f\n", juiceTakenTotal);



}
}

return 0;
}

Answer 1

您的代码的问题在于您从未将获取的果汁量添加到代码中的总数中。因此，在最后一个 if 语句之前，您需要添加该行。它看起来像:

scanf("%d", &juiceTaken);
juiceTakenTotal = juiceTakenTotal + juiceTaken;
        if(juiceTakenTotal>=10)
        printf("Your roomate owes you $%.2f\n", juiceTakenTotal);

这将解决您当前的问题。