Summary  
This chapter demonstrates how to use conditional branching and boolean comparisons to evaluate three numeric inputs and print the type of triangle they form.

General domain of usage  
Geometry processing

#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>
#include <iostream>
#include <sstream>

// Function declaration
double performOperation(int operationType, double a, double b);

// ------------------- Tests -------------------

TEST_CASE("Addition: performOperation(1, 5, 3) => 8 and prints 'Adding numbers'", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(1, 5.0, 3.0);

    std::cout.rdbuf(oldCout); // restore original buffer

    REQUIRE(result == Approx(8.0));
}

TEST_CASE("Subtraction: performOperation(2, 10, 4) => 6 and prints 'Subtracting numbers'", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(2, 10.0, 4.0);

    std::cout.rdbuf(oldCout);

    REQUIRE(result == Approx(6.0));
}

TEST_CASE("Multiplication: performOperation(3, 6, 7) => 42 and prints 'Multiplying numbers'", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(3, 6.0, 7.0);

    std::cout.rdbuf(oldCout);

    REQUIRE(result == Approx(42.0));
}

TEST_CASE("Division: performOperation(4, 20, 4) => 5 and prints 'Dividing numbers'", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(4, 20.0, 4.0);

    std::cout.rdbuf(oldCout);

    REQUIRE(result == Approx(5.0));
}

TEST_CASE("Division by zero: performOperation(4, 10, 0) => 0 and prints error", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(4, 10.0, 0.0);

    std::cout.rdbuf(oldCout);

    REQUIRE(result == Approx(0.0));
    REQUIRE(oss.str().find("Error: Division by zero") != std::string::npos);
}

TEST_CASE("Unknown operation: performOperation(99, 5, 5) => 0 and prints unknown operation", "[performOperation]") {
    std::ostringstream oss;
    std::streambuf* oldCout = std::cout.rdbuf(oss.rdbuf());

    double result = performOperation(99, 5.0, 5.0);

    std::cout.rdbuf(oldCout);

    REQUIRE(result == Approx(0.0));
    REQUIRE(oss.str().find("Invalid operation type") != std::string::npos);
}

test.cpp

Bienvenido a un curso para principiantes que le ayudará a aprender los conceptos fundamentales de las sentencias condicionales. Tanto si es nuevo en la programación como si desea mejorar su comprensión de las sentencias condicionales y cómo influyen en el flujo de sus programas, este curso está diseñado para satisfacer sus necesidades.

Esta es su puerta de entrada para comprender los componentes fundamentales de la toma de decisiones. Adquiera el conocimiento esencial para hacer que sus programas sean más inteligentes y receptivos.

Desafío: Manejador de Operaciones Matemáticas

Solución