我的大脑很痛苦。我无法想象这里发生了什么。如果允许有最佳答案的人，我会付钱。
我有这个学校的体重计划，它允许用户输入起始体重，而不是通过开关，它调用各种功能，允许用户增加体重或减肥。有些函数返回我期望的内容，有些则没有。这些函数返回我期望的cakeGain（），hardWorkout（），mediumWorkout（），但我无法弄清楚为什么我在runLoss（），burgerGain（），pizzaGain（）和easyWorkout（）上得到错误的返回。我似乎无法弄清楚功能之间的任何重大差异，我尝试了各种选项。我最初通过引用所有函数传递我的权重变量，并让它们更改值，但我的教师不想要所有的指针。
这不是很漂亮的代码，我已经注释了一些我稍后会修复的部分。我知道我的很多工作都是糟糕的形式（系统调用等）但我的导师并没有教我们替代方法或不关心。这仍然被认为是初学者课程。我很好奇的是为什么有些功能可以在其他功能不起作用时运行。
再次感谢，
迈克（我非常感谢所有花时间从他们的日程安排中帮助像我这样的人。我迫不及待地想要帮助其他人帮助他们。）#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#define pause system ("pause")
#define cls system ("cls")
#define flush fflush(stdin)
//prototype functions here
void mainMenu(void);
char getUserChoice();
double enterWeight();
double runLoss(double usersWeight);
double burgerGain(double usersWeight);
double eatPizza(double usersWeight);
double eatCake(double usersWeight);
double hardWorkout(double usersWeight);
double mediumWorkout(double usersWeight);
double easyWorkout(double usersWeight);
//void weightChecker(double usersWeight);
int main() {
//declare main variables here
char userChoice = ' ';
double usersWeight;
do {
userChoice = getUserChoice();
switch (userChoice) {
case'A': //get weight
usersWeight = enterWeight();
cls;
printf("Your starting weight is: %dlbs.\n\n",usersWeight);
break;
case'B': //run
usersWeight = runLoss(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'C': //eat burger
usersWeight = burgerGain(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'D': //eat pizza
usersWeight = eatPizza(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'E': //eat cake
usersWeight = eatCake(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'F': //hard workout
usersWeight = hardWorkout(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'G': //medium workout
usersWeight = mediumWorkout(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'H': //easy workout
usersWeight = easyWorkout(usersWeight);
cls;
printf("Your weight is now %d.\n", usersWeight);
//weightChecker(usersWeight);
break;
case'I': //quit
exit(0);
}
} while(userChoice != 'I');
return 0;
} //end of main
char getUserChoice() {
char result;
do {
mainMenu();
scanf("%c", &result);
flush;
result = toupper (result);
} while (result < 'A' || result > 'I');
return result;
}
void mainMenu(void) {
//cls;
printf("A) \tEnter starting weight or change weight\n");
printf("B) \tGo running\n");
printf("C) \tEat Hamburgers\n");
printf("D) \tEat pizza\n");
printf("E) \tEat cake\n");
printf("F) \tDo a hard workout\n");
printf("G) \tDo a medium workout\n");
printf("H) \tDo a easy workout\n");
printf("I) \tQuit\n\n");
printf("Enter your selection: ");
}
double enterWeight() {
double startingWeight = 0.0;
printf("Please enter your starting weight.\n");
scanf("%i", &startingWeight);
flush;
return startingWeight;
}
double runLoss(double usersWeight) {
double result;
double milesRan = 0.0;
double runMinus = 0.0;
printf("How many miles did you run?\n");
scanf("%i", &milesRan);
flush;
runMinus = milesRan * .005;
result = usersWeight - runMinus;
return result;
}
double burgerGain(double usersWeight) {
double result;
double hamburgersAte = 0.0;
double hamburgerGain = 0.0;
printf("How many hamburgers did you eat?\n");
scanf("%i", &hamburgersAte);
flush;
hamburgerGain = hamburgersAte * .005;
if (hamburgersAte > 2) {
hamburgerGain = hamburgerGain + .5;
}
result = usersWeight + hamburgerGain;
return result;
}
double eatPizza(double usersWeight) {
double result;
double pizzas = 0.0;
double pizzaGain = 0.0;
printf("How many pizza's did you eat?\n");
scanf("%i", &pizzas);
flush;
pizzaGain = pizzas * .075;
if (pizzas > 2) {
pizzaGain = pizzaGain + 1;
}
result = usersWeight + pizzaGain;
return result;
}
double eatCake(double usersWeight) {
double result;
double cakesEaten = 0.0;
double cakeGain = 0.0;
printf("How many cakes did you eat?\n");
scanf("%i", &cakesEaten);
flush;
cakeGain = cakesEaten * 2;
result = usersWeight + cakeGain;
return result;
}
double hardWorkout(double usersWeight) {
double result;
double hardWorkoutHours = 0.0;
double hardWorkoutLoss = 0.0;
printf("How many hours did you perform a hard workout?\n");
scanf("%i", &hardWorkoutHours);
flush;
hardWorkoutLoss = hardWorkoutHours * 1;
if (hardWorkoutHours > 2) {
hardWorkoutLoss = hardWorkoutLoss + 1;
}
result = usersWeight - hardWorkoutLoss;
return result;
}
double mediumWorkout(double usersWeight) {
double result;
double mediumWorkoutHours = 0.0;
double mediumWorkoutLoss = 0.0;
printf("How many hours did you perform a medium workout?\n");
scanf("%i", &mediumWorkoutHours);
flush;
mediumWorkoutLoss = mediumWorkoutHours * .5;
if (mediumWorkoutHours > 2) {
mediumWorkoutLoss = mediumWorkoutLoss + .25;
}
result = usersWeight - mediumWorkoutLoss;
return result;
}
double easyWorkout(double usersWeight) {
double result;
double easyWorkoutHours = 0.0;
double easyWorkoutLoss = 0.0;
printf("How many hours did you perform a easy workout?\n");
scanf("%i", &easyWorkoutHours);
flush;
easyWorkoutLoss = easyWorkoutHours * .025;
result = usersWeight - easyWorkoutLoss;
return result;
}
/*void weightChecker(double usersWeight) {
if (usersWeight >= 200 && usersWeight <= 400)
{
printf("You are obese, time to start working out.\n");
}
else if (usersWeight >= 150 && usersWeight < 200)
{
printf("Your weight is considered heavy, time to cut down on junk food.\n");
}
else if (usersWeight >= 125 && usersWeight <150)
{
printf("You are fit, keep up the good work.\n");
}
else if (usersWeight >= 80 && usersWeight <125)
{
printf("You are thin, time to start considering eating more.\n");
}
else
{
printf("You are dead due to improper weight management. Game Over!\n");
pause;
exit(0);
}
pause;
} */
答案 0 :(得分：1)
当您打印double或float值时，应使用％f
float x;
x = eatNutella();
printf("x is %f\n", x);
％d用于十进制值（如intp>