Control flow

if-else

C

src/c/basics/03-if-else.c

#include <stdio.h>

int main()
{
    int age = 0;

    printf("Please enter your age in years: ");
    scanf("%d", &age);

    if (age <= 18)
        printf("You are not an adult.\n");
    else if (age < 65)
        printf("You are an adult.\n");
    else
        printf("You are a senior citizen.\n");

    return 0;
}

C++

src/cpp/basics/03-if-else.cpp

#include <iostream>
using namespace std;

int main()
{
    int a = 6;
    int b = 5;

    if (a > b)
    {
        cout << "a is greater than b" << endl;
    }
    else if (a < b)
    {
        cout << "a is less than b" << endl;
    }
    else
    {
        cout << "a is equal to b" << endl;
    }

    return 0;
}

switch

C

src/c/basics/03-switch.c

#include <stdio.h>

int main()
{
    int age = 0, category;

    printf("Please enter your age in years: ");
    scanf("%d", &age);

    if (age < 0)
        category = 0;
    else if (age <= 18)
        category = 1;
    else if (age < 65)
        category = 2;
    else
        category = 3;

    switch (category)
    {
    case 0:
        printf("Invalid age.\n");
        break;
    case 1:
        printf("You are not an adult.\n");
        break;
    case 2:
        printf("You are an adult.\n");
        break;
    case 3:
        printf("You are a senior citizen.\n");
        break;

    default:
        printf("Should not be necessary here.\n");
        break;
    }

    return 0;
}

C++

src/cpp/basics/03-switch.cpp

#include <iostream>
using namespace std;

int main()
{
    int age = 0, category;

    cout << "Please enter your age in years: ";
    cin >> age;

    if (age < 0)
        category = 0;
    else if (age <= 18)
        category = 1;
    else if (age < 65)
        category = 2;
    else
        category = 3;

    switch (category)
    {
    case 0:
        cout << "Invalid age." << endl;
        break;
    case 1:
        cout << "You are not an adult." << endl;
        break;
    case 2:
        cout << "You are an adult." << endl;
        break;
    case 3:
        cout << "You are a senior citizen." << endl;
        break;

    default:
        cout << "Should not be necessary here." << endl;
        break;
    }

    return 0;
}

Ternary operator

C

src/c/basics/03-ternary.c

#include <stdio.h>

int main()
{
    int input1, input2, big;
    printf("Enter two integer numbers (separated by space): ");
    scanf("%d%d", &input1, &input2);

    big = (input1 > input2) ? input1 : input2;

    printf("Biggest number = %d\n", big);
    return 0;
}

C++

src/cpp/basics/03-ternary.cpp

#include <iostream>
using namespace std;

int main()
{
    int x = 5;
    int y = 9;

    const char *s = x > y ? "Yes" : "No";

    cout << s << endl;
    return 0;
}