(Financials: currency exchange) Write a program that prompts...

(Financials: currency exchange) Write a program that prompts the user to enter the exchange rate from currency in U.S. dollars to Chinese RMB. Prompt the user to enter 0 to convert from U.S. dollars to Chinese $\mathrm{RMB}$ and 1 to convert from Chinese $\mathrm{RMB}$ and U.S. dollars. Prompt the user to enter the amount in U.S. dollars or Chinese RMB to convert it to Chinese RMB or U.S. dollars, respectively. Here are the sample runs: Enter the exchange rate from dollars to RMB: 6.81 Enter 0 to convert dollars to $\mathrm{RMB}$ and 1 vice versa: 0 Enter the dollar amount: 100 $\$ 100.0$ is 681.0 yuan Enter the exchange rate from dollars to RMB: 6.81 Enter 0 to convert dollars to RMB and 1 vice versa: 1 Enter the RMB amount: 10000 10000.0 yuan is $\$ 1468.43$ Enter the exchange rate from dollars to RMB: 6.81 Enter 0 to convert dollars to $\mathrm{RMB}$ and 1 vice versa: 5 Incorrect input

(Financials: currency exchange) Write a program that prompts the user to enter the exchange rate from currency in U.S. dollars to Chinese RMB. Prompt the user to enter 0 to convert from U.S. dollars to Chinese $\mathrm{RMB}$ and 1 to convert from Chinese $\mathrm{RMB}$ and U.S. dollars. Prompt the user to enter the amount in U.S. dollars or Chinese RMB to convert it to Chinese RMB or U.S. dollars, respectively. Here are the sample runs:
Enter the exchange rate from dollars to RMB: 6.81
Enter 0 to convert dollars to $\mathrm{RMB}$ and 1 vice versa: 0
Enter the dollar amount: 100
$\$ 100.0$ is 681.0 yuan
Enter the exchange rate from dollars to RMB: 6.81
Enter 0 to convert dollars to RMB and 1 vice versa: 1
Enter the RMB amount: 10000
10000.0 yuan is $\$ 1468.43$
Enter the exchange rate from dollars to RMB: 6.81
Enter 0 to convert dollars to $\mathrm{RMB}$ and 1 vice versa: 5
Incorrect input

Key Concepts

Input Validation

Input validation involves checking the user's input to ensure that it meets the required criteria before the program proceeds. This step is critical in preventing errors by handling unexpected or invalid input values, such as an incorrect conversion option.

Arithmetic Operations

Arithmetic operations, particularly multiplication and division, are the fundamental calculations used in currency conversion. They apply the exchange rate to the currency amount in order to accurately compute the corresponding value in the target currency.

Conditional Logic

Conditional logic allows a program to perform different actions based on specific conditions or user choices. It is essential in scenarios where the program must decide between multiple conversion directions or handle incorrect inputs, ensuring that the correct operation is executed.

Exchange Rate

An exchange rate is the value of one currency expressed in terms of another currency. It serves as the multiplier in currency conversion programs, determining how much of one currency is equivalent to a unit amount of another.

Currency Conversion

Currency conversion involves the process of exchanging one type of currency for another based on a specific exchange rate. This concept is crucial in financial contexts where determining the relative value of different currencies is necessary for international transactions and comparisons.

User Input Handling

User input handling is the process of prompting the user for necessary data and then processing the entered values. In programming, this often involves reading command line or graphical inputs, converting them into the appropriate data types, and using them for further calculations or decisions.

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