更改計數器c程序不顯示正確的輸出

Question

我正在改變計數器程序，我卡住了，我在這裏和其他2個編碼論壇，谷歌和YouTube的，但還沒有找到答案...我的程序很爛，我是全新的C/C++ ...我的TXT書還沒有在這裏，所以我正在努力閱讀每一件事，我可以得到我的手，直到它到達這裏

這是什麼輸出應該在控制檯窗口：

Welcome to Change Counter by Jo Mama!! 
Please enter the total amount of purchase: $52.173 
$52.173 
Please enter amount of money tendered: $60 
$60.00 
Your change is: $7.83 
------------------------------------------- 
Twenties : 0 
Tens : 0 
Fives : 1 
Ones : 2 
Quarters : 3 
Dimes : 0 
Nickels : 1 
Pennies : 3 
------------------------------------------- 
Thank you for using Change Counter! 

這裏是我迄今爲止...

#include <stdio.h> 
#include <stdlib.h> 
#include <math.h> 


int main(void) 
{ 
// define variables here 
long double numberOfTwenties = 0; 
long double numberOfTens = 0; 
long double numberOfFives = 0; 
long double numberOfOnes = 0; 
long double numberOfQuarters = 0; 
long double numberOfDimes = 0; 
long double numberOfNickels = 0; 
long double numberOfPennies = 0; 
double purchasePrice = 0; 
double amountTendered = 0; 
double amountOfChange = 0; 
double amountOfChangeCents = 0; 

// start program here 
printf("Welcome to the change counter by Josh Manion!!\n\n"); 
printf("Please enter the total amount of purchase: $"); 
scanf("%d", &purchasePrice); 
printf("%d\n", purchasePrice); 
printf("Please enter amount of money tendered: $"); 
scanf("%d", &amountTendered); 
printf("%d\n", amountTendered); 

//do change calculations here 
amountOfChange = (amountTendered - purchasePrice); 
printf("Your change is: $%d\n", amountOfChange); 

numberOfTwenties = amountOfChange/20; 
//amountOfChange = numberOfTwenties %= amountOfChange; 
numberOfTens = (amountOfChange/10); 
numberOfFives = (amountOfChange/5); 
numberOfOnes = (amountOfChange/1); 
numberOfQuarters = (amountOfChange * 0.25); 

// print change calculations here 


printf("---------------------------------------------\n"); 
//display denominations of change here 
printf("Twenties: %d\n", numberOfTwenties); 
printf("Tens: %d\n", numberOfTens); 
printf("Fives: %d\n", numberOfFives); 
printf("Ones: %d\n", numberOfOnes); 
printf("Quarters: %d\n", numberOfQuarters); 
printf("Dimes: %d\n", numberOfDimes); 
printf("Nickels: %d\n", numberOfNickels); 
printf("Pennies: %d\n", numberOfPennies); 

printf("---------------------------------------------\n"); 
printf("Thank you for using the Change Counter!"); 

getchar(); 
return EXIT_SUCCESS; 
} 

問題是我的程序不工作，它顯示提示後的變化，但不是面值的細分，我傾向於使用「％」來降低變化量，但我還沒有找到任何示例。我不知道還有什麼要說...除了我是新的，這個職位將幫助很多人...

Answer 1

您的程序有未定義的行爲：您必須使用%Lf作爲printf修飾符來打印long double（與您的使用scanf相同的問題）