Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære If Statement | Introduction to Conditional Statements
C++ Conditional Statements

book
If Statement

The if statement is a foundational building block of control flow in most programming languages. It allows a program to make decisions and execute different blocks of code based on whether a given condition is true or false. The idea behind if statements is simple: If a condition is met, do something, otherwise, don’t.

h

if

copy
if (condition)
{
// Code to be executed if the condition is true
}

              
1234

            
if (condition)
{
    // Code to be executed if the condition is true
}

A condition is a boolean expression that evaluates to either true or false. If it is true, the code within the curly braces { } is executed; otherwise, if the condition is false, the code inside the block is skipped, and the program continues with the next statement following the if block.

cpp

main

copy
#include <iostream>

int main()
{
int age = 33; // Declaring and initializing a variable
if (age >= 18) // Checking whether the age is greater or equal to 18
{
// If so, output the message
std::cout << "You are an adult" << std::endl;
}
}

              
123456789101112

            
#include <iostream>

int main() 
{
    int age = 33; // Declaring and initializing a variable
    
    if (age >= 18) // Checking whether the age is greater or equal to 18
    {
		// If so, output the message
        std::cout << "You are an adult" << std::endl;
    }
}

If you have an if statement with only one statement to be executed when the condition is true, you can omit the curly braces { }.

h

with_braces

h

without_braces

copy
if (condition)
{
statement;
}

              
1234

            
if (condition)
{
    statement;
}
Opgave

Swipe to start coding

  1. Check if a two dimensional square with x (length) and y (height) can fit into another square with dimensions x1 (length) and y1 (height).
  2. Output Can fit in console if it can.

Løsning

cpp

solution

#include <iostream>

int main()
{
int x = 5, y = 2;
int x1 = 7, y1 = 3;

if (x < x1 && y < y1)
{
std::cout << "Can fit";
}
}
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 3
#include <iostream>

int main()
{
int x = 5, y = 2;
int x1 = 7, y1 = 3;

__ (___)
{
std::cout << "Can fit";
}
}

Spørg AI

expand
ChatGPT

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

some-alt