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copied!<p>Here are the suggestions for your program: <br><br> 1. Use something like <code>system("pause");</code> to pause the program or make change in project settings if you are using Visual Studio so that debug windows waits for you after execution.<br><br> 2. For next <code>if</code> statements you should use else statement and surround by braces. Here's an example,</p> <pre><code>else if (unit == 'p') { if (amount == 1) std::cout << amount << " pound is $" << amount * pound_per_dollar << " dollars.\n"; else std::cout << amount << " pounds is $" << amount * pound_per_dollar << " dollars.\n"; } </code></pre> <p>If you do it in this way your last <code>else</code> statement will give you correct result. Otherwise you'll always get "Sorry, that input isn't in the correct format" except for 'e'. Indeed, that's what happening in your program.<br><br> 3. You should do add a <code>return 0</code> statement for your <code>int</code> return type of <code>main</code> function.<br><br> 4. Instead of typing std every time you can add this statement once,</p> <pre><code>using namespace std; </code></pre> <p>after your include preprocessors and may omit including <code>std namespace</code> afterwards like this,</p> <pre><code>cout << "Please enter a amount followed by a unit (p, y, or e): "; </code></pre> <p><br>5. e is a reserved char for using with integer/double etc numeric types. e means exponential. When entering currency, use a space before to explicitly tell cin that this e is not part of numerical input. Otherwise, you have to parse the input using strings.</p>

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