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Ejercicio: Elabora una calculadora completa en el lenguaje C++ 
Solución: 
#include <iostream> 
#include <string> 
#include <stack> 
#include <cmath> 
 
// Función para evaluar una expresión matemática 
double evaluateExpression(const std::string& expression) { 
 std::stack<double> numbers; 
 std::stack<char> operators; 
 
 for (char c : expression) { 
 if (isspace(c)) { 
 continue; 
 } else if (isdigit(c)) { 
 std::string numberStr; 
 numberStr += c; 
 
 while (isdigit(expression[++i])) { 
 numberStr += expression[i]; 
 } 
 
 numbers.push(std::stod(numberStr)); 
 
 } else if (c == '(') { 
 operators.push(c); 
 } else if (c == ')') { 
 while (operators.top() != '(') { 
 double operand2 = numbers.top(); 
 numbers.pop(); 
 double operand1 = numbers.top(); 
 numbers.pop(); 
 char op = operators.top(); 
 operators.pop(); 
 
 if (op == '+') { 
 numbers.push(operand1 + operand2); 
 } else if (op == '-') { 
 numbers.push(operand1 - operand2); 
 } else if (op == '*') { 
 numbers.push(operand1 * operand2); 
 } else if (op == '/') { 
 numbers.push(operand1 / operand2); 
 } else if (op == '^') { 
 numbers.push(pow(operand1, operand2)); 
 } 
 } 
 
 
 operators.pop(); 
 } else { 
 while (!operators.empty() && operators.top() != '(' && (precedence(c) 
<= precedence(operators.top()))) { 
 double operand2 = numbers.top(); 
 numbers.pop(); 
 double operand1 = numbers.top(); 
 numbers.pop(); 
 char op = operators.top(); 
 operators.pop(); 
 
 if (op == '+') { 
 numbers.push(operand1 + operand2); 
 } else if (op == '-') { 
 numbers.push(operand1 - operand2); 
 } else if (op == '*') { 
 numbers.push(operand1 * operand2); 
 } else if (op == '/') { 
 numbers.push(operand1 / operand2); 
 } else if (op == '^') { 
 numbers.push(pow(operand1, operand2)); 
 } 
 } 
 
 operators.push(c); 
 
 } 
 } 
 
 while (!operators.empty()) { 
 double operand2 = numbers.top(); 
 numbers.pop(); 
 double operand1 = numbers.top(); 
 numbers.pop(); 
 char op = operators.top(); 
 operators.pop(); 
 
 if (op == '+') { 
 numbers.push(operand1 + operand2); 
 } else if (op == '-') { 
 numbers.push(operand1 - operand2); 
 } else if (op == '*') { 
 numbers.push(operand1 * operand2); 
 } else if (op == '/') { 
 numbers.push(operand1 / operand2); 
 } else if (op == '^') { 
 numbers.push(pow(operand1, operand2)); 
 } 
 } 
 
 
 return numbers.top(); 
} 
 
int main() { 
 std::string expression; 
 
 std::cout << "Ingrese una expresión matemática: "; 
 std::getline(std::cin, expression); 
 
 double result = evaluateExpression(expression); 
 
 std::cout << "El resultado es: " << result << std::endl; 
 
 return 0; 
}