我提示用户是否要订购鱼，一旦他们订购了鱼，他们被要求订购薯片，然后喝。一旦饮料完成，我需要总共所有价格，然后我需要列出它们。
问题是，我不知道如何“统计”所有总数。我如何编写一个函数来计算小计？
我的程序获取subTotal的方式是：
subTotal(typeOfFood, foodChoice, foodSize, foodOrders);
在我的小计函数中，根据他们选择的食物类型，它只有subtotal+= $x.xx。
我尝试制作这样的函数：
float accumTotal（int total）{ float finalTotal; finalTotal + =总数; return finalTotal; }
但这没效果。
我的proglram的OUTPUT ：
Do you order FISH (Y/N)? y
Fish choice (K- Haddock, T- Halibut): t
What size (L-Large, M-Medium, S-Small): l
How many orders do you want? (>=0): 2
You ordered: [fish]: [Halibut], Size: [Large], ordered: [2], subtotal: [8.00]
Do you order FISH (Y/N)? y
Fish choice (K- Haddock, T- Halibut): t
What size (L-Large, M-Medium, S-Small): s
How many orders do you want? (>=0): 2
You ordered: [fish]: [Halibut], Size: [Small], ordered: [2], subtotal: [4.80]
Do you order FISH (Y/N)? n
Do you order CHIPS (Y/N)? y
Chips choice (C- Cut, R- Rings): r
What size (L-Large, M-Medium, S-Small): m
How many orders do you want? (>=0): 5
You ordered: [chips]: [Ring], Size: [Medium], ordered: [5], subtotal: [12.00]
Do you order CHIPS (Y/N)? n
Do you order DRINKS (Y/N)? n
============================
ACCUMULATIVE TOTAL = $x.xx
消息来源：虽然不是真的必要
#include <stdio.h>
#include <string.h>
int processing(char *typeOfFood, char foodChoice, char foodSize, int foodOrders);
float subTotal(char *typeOfFood, char foodChoice, char foodSize, int foodOrders);
float accumTotal(int total);
float subTotal(char *typeOfFood, char foodChoice, char foodSize, int foodOrders) {
float subTotal = 0;
if ((strcmp(typeOfFood, "fish")) == 0) {
if (foodChoice == 'k' || foodChoice == 'K') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 3.00;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 4.00;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 5.00;
}
}
else if (foodChoice == 't' || foodChoice == 'T') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 2.40;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 3.20;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 4.00;
}
}
}
if ((strcmp(typeOfFood, "chips")) == 0) {
if (foodChoice == 'c' || foodChoice == 'C') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 1.20;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 1.60;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 2.00;
}
}
else if (foodChoice == 'r' || foodChoice == 'R') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 1.80;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 2.40;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 3.00;
}
}
}
if ((strcmp(typeOfFood, "drink")) == 0) {
if (foodChoice == 's' || foodChoice == 'S') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 1.20;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 1.60;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 2.00;
}
}
else if (foodChoice == 'c' || foodChoice == 'C') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 1.05;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 1.40;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 1.75;
}
}
else if (foodChoice == 't' || foodChoice == 'T') {
if (foodSize == 's' || foodSize == 'S') {
subTotal += 0.90;
}
else if (foodSize == 'm' || foodSize == 'M') {
subTotal += 1.20;
}
else if (foodSize == 'l' || foodSize == 'L'){
subTotal += 1.50;
}
}
} // ifs
subTotal = subTotal * foodOrders;
return subTotal;
}
float accumTotal(int total) {
// float finalTotal;
// finalTotal += total;
// printf("[%lf]", finalTotal);
// return finalTotal;
}
int processing(char *typeOfFood, char foodChoice, char foodSize, int foodOrders){
char *foodSizeSelect, *foodChoiceSelect;
float total = subTotal(typeOfFood, foodChoice, foodSize, foodOrders);
if ((strcmp(typeOfFood, "fish")) == 0){
switch (foodChoice) {
case 'k':
foodChoiceSelect = "Haddock";
break;
case 'K':
foodChoiceSelect = "Haddock";
break;
case 't':
foodChoiceSelect = "Halibut";
break;
case 'T':
foodChoiceSelect = "Halibut";
break;
}
}
else if ((strcmp(typeOfFood, "chips")) == 0){
switch (foodChoice) {
case 'c':
foodChoiceSelect = "Cut";
break;
case 'C':
foodChoiceSelect = "Cut";
break;
case 'r':
foodChoiceSelect = "Ring";
break;
case 'R':
foodChoiceSelect = "Ring";
break;
}
}
else if ((strcmp(typeOfFood, "drinks")) == 0){
switch (foodChoice) {
case 's':
foodChoiceSelect = "Softdrink";
break;
case 'S':
foodChoiceSelect = "Softdrink";
break;
case 'c':
foodChoiceSelect = "Coffee";
break;
case 'C':
foodChoiceSelect = "Coffee";
break;
case 't':
foodChoiceSelect = "Tea";
break;
case 'T':
foodChoiceSelect = "Tea";
break;
}
}
switch (foodSize) {
case 's':
foodSizeSelect = "Small";
break;
case 'S':
foodSizeSelect = "Small";
break;
case 'm':
foodSizeSelect = "Medium";
break;
case 'M':
foodSizeSelect = "Medium";
break;
case 'l':
foodSizeSelect = "Large";
break;
case 'L':
foodSizeSelect = "Large";
break;
}
printf("You ordered: [%s]: [%s], Size: [%s], ordered: [%d], subtotal: [%.2lf]\n\n", typeOfFood, foodChoiceSelect, foodSizeSelect, foodOrders, total);
}
int main() {
char fishYesNo, chipsYesNo, drinksYesNo;
char fishChoice, fishSize; int fishOrders;
char chipsChoice, chipsSize; int chipsOrders;
char drinksChoice, drinksSize; int drinksOrders;
char *typeOfFood;
do {
typeOfFood = "fish";
printf("Do you order FISH (Y/N)? ");
scanf(" %c", &fishYesNo);
if (fishYesNo != 'n' || fishYesNo != 'n') {
printf("Fish choice (K- Haddock, T- Halibut): ");
scanf(" %c", &fishChoice);
printf("What size (L-Large, M-Medium, S-Small): ");
scanf(" %c", &fishSize);
printf("How many orders do you want? (>=0): ");
scanf("%d", &fishOrders);
processing(typeOfFood, fishChoice, fishSize, fishOrders);
}
else if (fishYesNo == 'n' || fishYesNo == 'N') {
typeOfFood = "chips";
}
} while ((strcmp(typeOfFood, "fish")) == 0);
do {
typeOfFood = "chips";
printf("Do you order CHIPS (Y/N)? ");
scanf(" %c", &chipsYesNo);
if (chipsYesNo != 'n') {
printf("Chips choice (C- Cut, R- Rings): ");
scanf(" %c", &chipsChoice);
printf("What size (L-Large, M-Medium, S-Small): ");
scanf(" %c", &chipsSize);
printf("How many orders do you want? (>=0): ");
scanf("%d", &chipsOrders);
processing(typeOfFood, chipsChoice, chipsSize, chipsOrders);
}
else if (chipsYesNo == 'n' || chipsYesNo == 'N') {
typeOfFood = "drinks";
}
} while ((strcmp(typeOfFood, "chips")) == 0);
do {
typeOfFood = "drinks";
printf("Do you order DRINKS (Y/N)? ");
scanf(" %c", &drinksYesNo);
if (drinksYesNo != 'n') {
printf("Drinks choice (S- Softdrink, C- Coffee, T- Tea): ");
scanf(" %c", &drinksChoice);
printf("What size (L-Large, M-Medium, S-Small): ");
scanf(" %c", &drinksSize);
printf("How many orders do you want? (>=0): ");
scanf("%d", &drinksOrders);
processing(typeOfFood, drinksChoice, drinksSize, drinksOrders);
}
else if (drinksYesNo == 'n' || drinksYesNo == 'N') {
}
} while ((strcmp(typeOfFood, "drinks")) == 0);
}
答案 0 :(得分：3)
您需要的是一个跟踪变量来记录运行总计：
void processing(char *typeOfFood, char foodChoice, char foodSize, int foodOrders, float *subTotal)
{
...
printf("You ordered: [%s]: [%s], Size: [%s], ordered: [%d], subtotal: [%.2lf]\n\n", typeOfFood, foodChoiceSelect, foodSizeSelect, foodOrders, total);
*subTotal += total; // add to the total.
}
int main () {
...
char *typeOfFood;
float subTotal = 0.0f;
...
...
// for each call to 'processing'
processing(typeOfFood, fishChoice, fishSize, fishOrders, &subTotal);
...
...
// when the drinks are done:
else if (drinksYesNo == 'n' || drinksYesNo == 'N') {
printf("your bill totals to $%.2f", subTotal);
break; // note the added 'break' so that the program exits.
}
...
}