我是编程新手，最近决定学习C.每当我在Dev C ++中编译和运行我的程序时，输出总是0.000000。我做错了什么？
#include <stdio.h>
#include <conio.h>
void printHeader();
float basicFee();
float additionalCharges();
float printFees(float monthlyFee, float addFee);
int main() {
float monthlyFee;
float addFee;
printHeader();
basicFee();
additionalCharges();
printFees(monthlyFee, addFee);
return 0;
}
void printHeader() {
printf("Welcome to Tolba Health Care\nWe care about you!");
printf("\nMonthly fees are:\n\t$59.99 for a single membership\n\t$69.99 for a couple membership\n\t$89.99 for a family membership");
printf("\n\nWe also offer:\n\tTennis for $18.99 a month\n\tGlf for $21.99 a month\n\tRacquetball for $15.99 a month");
printf("\n\nWe are running a special -- if you pay\nfor six months in advance, you receive 10%% off!");
}
float basicFee() {
char typeMemb;
float monthlyFee;
printf("\nWould you like a:\n(S) Single Membership\n(C) Couple Membership\n(F) Family Membership");
scanf(" %c", &typeMemb);
if (typeMemb == 'S' || typeMemb == 's') {
monthlyFee = 59.99;
} else
if (typeMemb == 'C' || typeMemb == 'c') {
monthlyFee = 69.99;
} else
if (typeMemb == 'F' || typeMemb == 'f') {
monthlyFee == 89.99;
} else {
printf("\nPlease enter a valid form of membership.");
}
return monthlyFee;
}
float additionalCharges() {
char tennisOpt, golfOpt, racOpt;
float tennisFee, golfFee, racFee;
printf("\nWould you like to add any of the following? (Y) for yes, (N) for no");
printf("\n\tTennis?: ");
scanf(" %c", &tennisOpt);
if (tennisOpt == 'Y' || tennisOpt == 'y') {
tennisFee = 18.99;
} else
if (tennisOpt == 'N' || tennisOpt == 'n') {
tennisFee = 0.0;
} else {
printf("Please enter a valid answer (Yes or No)");
}
printf("\n\tGolf?: ");
scanf(" %c", &golfOpt);
if (golfOpt == 'Y' || golfOpt == 'y') {
golfFee = 21.99;
} else
if (golfOpt == 'N' || golfOpt == 'n') {
golfFee = 0.0;
} else {
printf("Please enter a valid answer (Yes or No)");
}
printf("\n\tRacquetball?: ");
scanf(" %c", &racOpt);
if (racOpt == 'Y' || racOpt == 'y') {
racFee = 15.99;
} else
if (racOpt == 'N' || racOpt == 'n'){
racFee = 0.0;
} else {
printf("Please enter a valid answer (Yes or No)");
}
float addFee = tennisFee + golfFee + racFee;
return addFee;
}
float printFees(float monthlyFee, float addFee) {
char discountOpt;
float oneMonth = monthlyFee + addFee, sixMonths = oneMonth * 6,
discount = sixMonths * .10, rdiscount,
totalDue = sixMonths - rdiscount;
printf("\nMonthly Fee: $%f", monthlyFee);
printf("\nAdditional Fees: $%f", addFee);
printf("\nTotal for one month: $%f", oneMonth);
printf("\n\nReceive a 10%% discount - $%f by paying for six months advance", discount);
printf("\nWithout discount, six months would cost $%f", sixMonths);
printf("\nWould you like to receive a discount?");
scanf(" %c", &discountOpt);
if (discountOpt == 'Y' || discountOpt == 'y') {
rdiscount = discount;
} else
if (discountOpt == 'N' || discountOpt == 'n') {
rdiscount = 0.0;
} else {
printf("Please enter a valid answer (Yes or No)");
}
printf("Total due is $%f", totalDue);
printf("\nThank you for joining our club!");
return;
}
答案 0 :(得分：1)
您需要对代码进行一些更改。赋值运算符是=，而您使用了==（应该用于比较）。接下来，您的函数声明表明它们将返回值，但您不会将这些返回值存储在main中（因此您将获得0.000000作为输出）。
#include <stdio.h>
void printHeader();
float basicFee();
float additionalCharges();
float printFees(float monthlyFee, float addFee);
int main(){
float monthlyFee=0.0f;
float addFee=0.0f;
printHeader();
monthlyFee=basicFee();
addFee=additionalCharges();
printFees(monthlyFee, addFee);
return 0;
}
void printHeader()
{
printf("Welcome to Tolba Health Care\nWe care about you!");
printf("\nMonthly fees are:\n\t$59.99 for a single membership\n\t$69.99 for a couple membership\n\t$89.99 for a family membership");
printf("\n\nWe also offer:\n\tTennis for $18.99 a month\n\tGlf for $21.99 a month\n\tRacquetball for $15.99 a month");
printf("\n\nWe are running a special -- if you pay\nfor six months in advance, you recieve 10%% off!");
}
float basicFee(){
char typeMemb;
float monthlyFee;
printf("\nWould you like a:\n(S) Single Membership\n(C) Couple Membership\n(F) Family Membership");
scanf(" %c", &typeMemb);
if (typeMemb=='S' || typeMemb=='s'){
monthlyFee=59.99;
}
else if (typeMemb=='C' || typeMemb=='c'){
monthlyFee=69.99;
}
else if (typeMemb=='F' || typeMemb=='f'){
monthlyFee=89.99;
}
else{
printf("\nPlease enter a valid form of membership.");
}
return monthlyFee;
}
float additionalCharges(){
char tennisOpt, golfOpt, racOpt;
float tennisFee, golfFee, racFee;
printf("\nWould you like to add any of the following? (Y) for yes, (N) for no");
printf("\n\tTennis?: ");
scanf(" %c", &tennisOpt);
if (tennisOpt=='Y' || tennisOpt=='y'){
tennisFee=18.99;
}
else if (tennisOpt=='N' || tennisOpt=='n'){
tennisFee=0.0;
}
else{
printf("Please enter a valid answer (Yes or No)");
}
printf("\n\tGolf?: ");
scanf(" %c", &golfOpt);
if (golfOpt=='Y' || golfOpt=='y'){
golfFee=21.99;
}
else if (golfOpt=='N' || golfOpt=='n'){
golfFee=0.0;
}
else{
printf("Please enter a valid answer (Yes or No)");
}
printf("\n\tRacquetball?: ");
scanf(" %c", &racOpt);
if (racOpt=='Y' || racOpt=='y'){
racFee=15.99;
}
else if (racOpt=='N' || racOpt=='n'){
racFee=0.0;
}
else{
printf("Please enter a valid answer (Yes or No)");
}
float addFee = tennisFee + golfFee + racFee;
return addFee;
}
float printFees(float monthlyFee, float addFee){
char discountOpt;
float oneMonth = monthlyFee + addFee, sixMonths = oneMonth * 6, discount = sixMonths * .10, rdiscount, totalDue = sixMonths - rdiscount;
printf("\nMonthly Fee: $%f", monthlyFee);
printf("\nAdditional Fees: $%f", addFee);
printf("\nTotal for one month: $%f", oneMonth);
printf("\n\nReceive a 10%% discount - $%f by paying for six months advance", discount);
printf("\nWithout discount, six months would cost $%f", sixMonths);
printf("\nWould you like to receive a discount?");
scanf(" %c", &discountOpt);
if (discountOpt=='Y' || discountOpt=='y'){
rdiscount=discount;
}
else if (discountOpt=='N' || discountOpt=='n'){
rdiscount=0.0;
}
else{
printf("Please enter a valid answer (Yes or No)");
}
printf("Total due is $%f", totalDue);
printf("\nThank you for joining our club!");
return 0;
}