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

Bienvenue dans un cours adapté aux débutants qui vous aidera à apprendre les concepts fondamentaux des instructions conditionnelles. Que vous soyez novice en programmation ou que vous souhaitiez approfondir votre compréhension des instructions conditionnelles et de leur influence sur le flux de vos programmes, ce cours est conçu pour répondre à vos besoins.

Voici votre porte d'entrée pour comprendre les éléments fondamentaux de la prise de décision. Acquérez les connaissances essentielles pour rendre vos programmes plus intelligents et réactifs.

Défi : Gestionnaire d’Opérations Mathématiques

Solution