Challenge: 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.
if.h
1234if (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.
main.cpp
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 { }.
with_braces.h
without_braces.h
1234if (condition) { statement; }
Swipe to start coding
You are building a shopping system where customers may receive a discount based on the total amount of their purchase.
The function calculateDiscount takes a double parameter totalPurchase representing the total sum of the customer's purchase.
- Initialize a variable
discountwith0.0. - Check if
totalPurchaseis greater than or equal to100.- If it is, set the discount to 30 percent of the total purchase. Multiply
totalPurchaseby 0.3
- If it is, set the discount to 30 percent of the total purchase. Multiply
- Return the value of
discountfrom the function.
Example
calculateDiscount(50) → 0.0
calculateDiscount(100) → 30.0
calculateDiscount(200) → 60.0
Solución
solution.cpp
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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.
if.h
1234if (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.
main.cpp
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 { }.
with_braces.h
without_braces.h
1234if (condition) { statement; }
Swipe to start coding
You are building a shopping system where customers may receive a discount based on the total amount of their purchase.
The function calculateDiscount takes a double parameter totalPurchase representing the total sum of the customer's purchase.
- Initialize a variable
discountwith0.0. - Check if
totalPurchaseis greater than or equal to100.- If it is, set the discount to 30 percent of the total purchase. Multiply
totalPurchaseby 0.3
- If it is, set the discount to 30 percent of the total purchase. Multiply
- Return the value of
discountfrom the function.
Example
calculateDiscount(50) → 0.0
calculateDiscount(100) → 30.0
calculateDiscount(200) → 60.0
Solución
solution.cpp
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