If statement in C++ - Mini Project: Build & Apply

If statement

📖 Scenario: You are creating a simple program that checks if a number is positive or not. This is like checking if the temperature outside is above zero degrees to decide if you need a jacket.

🎯 Goal: Build a program that uses an if statement to check if a number is positive and prints a message accordingly.

📋 What You'll Learn

Create an integer variable called number with the value 10

Create a boolean variable called isPositive that will store if the number is positive

Use an if statement to set isPositive to true if number is greater than 0

Print "The number is positive" if isPositive is true

💡 Why This Matters

🌍 Real World

Checking conditions like this helps programs make decisions, such as turning on a heater if the temperature is cold.

💼 Career

Understanding if statements is essential for any programming job because it controls the flow of decisions in software.

1

DATA SETUP: Create the number variable

Create an integer variable called number and set it to 10.

C++

# Your code here

Need a hint?

Use int number = 10; to create the variable.

2

CONFIGURATION: Create the isPositive variable

Create a boolean variable called isPositive and set it to false.

C++

int number = 10;
// Your code here

Need a hint?

Use bool isPositive = false; to create the variable.

3

CORE LOGIC: Use if statement to check positivity

Use an if statement to check if number is greater than 0. Inside the if, set isPositive to true.

C++

int number = 10;
bool isPositive = false;
// Your code here

Need a hint?

Write if (number > 0) { isPositive = true; } to check and update the variable.

4

OUTPUT: Print the result if number is positive

Write a std::cout statement to print "The number is positive" only if isPositive is true.

C++

int number = 10;
bool isPositive = false;
if (number > 0) {
    isPositive = true;
}
// Your code here

Need a hint?

Use if (isPositive) { std::cout << "The number is positive" << std::endl; } to print the message.