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| 1 | +#include <iostream> // Include input/output stream library |
| 2 | +#include <cmath> // Include math library for advanced operations |
| 3 | +#include <limits> // Include limits library to handle invalid input |
| 4 | + |
| 5 | +// Function prototypes |
| 6 | +void displayMenu(); |
| 7 | +double getNumber(const std::string& prompt); |
| 8 | +char getOperation(); |
| 9 | +double calculate(double num1, double num2, char op); |
| 10 | +bool shouldContinue(); |
| 11 | + |
| 12 | +int main() { |
| 13 | + std::cout << "Simple Calculator Program\n"; |
| 14 | + std::cout << "=======================\n"; |
| 15 | + |
| 16 | + bool continueCalculation = true; |
| 17 | + |
| 18 | + // Main program loop — continues until user decides to exit |
| 19 | + while (continueCalculation) { |
| 20 | + displayMenu(); |
| 21 | + |
| 22 | + double firstNumber = getNumber("Enter the first number: "); |
| 23 | + double secondNumber = getNumber("Enter the second number: "); |
| 24 | + char operation = getOperation(); |
| 25 | + |
| 26 | + // Perform calculation and display result |
| 27 | + double result = calculate(firstNumber, secondNumber, operation); |
| 28 | + std::cout << "Result: " << firstNumber << " " << operation |
| 29 | + << " " << secondNumber << " = " << result << "\n\n"; |
| 30 | + |
| 31 | + // Ask user if they want to perform another calculation |
| 32 | + continueCalculation = shouldContinue(); |
| 33 | + } |
| 34 | + |
| 35 | + std::cout << "Thank you for using the calculator. Goodbye!\n"; |
| 36 | + return 0; |
| 37 | +} |
| 38 | + |
| 39 | +// Displays the available operations to the user |
| 40 | +void displayMenu() { |
| 41 | + std::cout << "Available operations:\n"; |
| 42 | + std::cout << "+ : Addition\n"; |
| 43 | + std::cout << "- : Subtraction\n"; |
| 44 | + std::cout << "* : Multiplication\n"; |
| 45 | + std::cout << "/ : Division\n"; |
| 46 | + std::cout << "^ : Power (first number raised to the power of second number)\n"; |
| 47 | + std::cout << "--------------------------------\n"; |
| 48 | +} |
| 49 | + |
| 50 | +// Prompts the user to enter a number and validates the input |
| 51 | +double getNumber(const std::string& prompt) { |
| 52 | + double number; |
| 53 | + while (true) { |
| 54 | + std::cout << prompt; |
| 55 | + std::cin >> number; |
| 56 | + |
| 57 | + // Check if input is valid (not a string or special character) |
| 58 | + if (std::cin.fail()) { |
| 59 | + std::cin.clear(); // Clear the error flag |
| 60 | + std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); // Ignore invalid input |
| 61 | + std::cout << "Invalid input. Please enter a valid number.\n"; |
| 62 | + } else { |
| 63 | + break; // Valid number entered, exit loop |
| 64 | + } |
| 65 | + } |
| 66 | + return number; |
| 67 | +} |
| 68 | + |
| 69 | +// Gets the arithmetic operation from the user and validates it |
| 70 | +char getOperation() { |
| 71 | + char operation; |
| 72 | + while (true) { |
| 73 | + std::cout << "Enter the operation (+, -, *, /, ^): "; |
| 74 | + std::cin >> operation; |
| 75 | + |
| 76 | + // Validate operation input |
| 77 | + if (operation == '+' || operation == '-' || operation == '*' || |
| 78 | + operation == '/' || operation == '^') { |
| 79 | + break; |
| 80 | + } else { |
| 81 | + std::cout << "Invalid operation. Please enter one of: +, -, *, /, ^\n"; |
| 82 | + } |
| 83 | + } |
| 84 | + return operation; |
| 85 | +} |
| 86 | + |
| 87 | +// Performs the specified arithmetic operation on two numbers |
| 88 | +double calculate(double num1, double num2, char op) { |
| 89 | + switch (op) { |
| 90 | + case '+': |
| 91 | + return num1 + num2; |
| 92 | + case '-': |
| 93 | + return num1 - num2; |
| 94 | + case '*': |
| 95 | + return num1 * num2; |
| 96 | + case '/': |
| 97 | + if (num2 != 0) { |
| 98 | + return num1 / num2; |
| 99 | + } else { |
| 100 | + std::cout << "Error: Division by zero is not allowed.\n"; |
| 101 | + return 0; // Return 0 in case of division by zero |
| 102 | + } |
| 103 | + case '^': |
| 104 | + return std::pow(num1, num2); // Use pow function for exponentiation |
| 105 | + default: |
| 106 | + std::cout << "Unknown operation.\n"; |
| 107 | + return 0; |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +// Asks the user whether to continue with another calculation |
| 112 | +bool shouldContinue() { |
| 113 | + char choice; |
| 114 | + while (true) { |
| 115 | + std::cout << "Do you want to perform another calculation? (y/n): "; |
| 116 | + std::cin >> choice; |
| 117 | + |
| 118 | + if (choice == 'y' || choice == 'Y') { |
| 119 | + return true; |
| 120 | + } else if (choice == 'n' || choice == 'N') { |
| 121 | + return false; |
| 122 | + } else { |
| 123 | + std::cout << "Please enter 'y' for yes or 'n' for no.\n"; |
| 124 | + } |
| 125 | + } |
| 126 | +} |
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