Gain insights into basic computer anatomy, binary systems, and program lifecycles. Delve into logic building and core programming concepts with hands-on exercises and quizzes to reinforce learning.

This language-agnostic course is your guide to programming and acquiring problem-solving skills. You will start reviewing the anatomy of computers and the binary number system. You will then look at the lifecycle of a program before moving on to the core concepts of programming. Overall, the primary focus of this course is logic building within the context of computer science and programming.

Throughout each chapter, you will get hands-on experience with exercises and quizzes to solidify what you’ve learned. If you’re looking to build strong programming fundamentals then this course is the perfect place to start.

Introduction to Computers & Programming

# Problem statement

Suppose you have the body mass index (BMI) of a person, and you want to find out if the person is underweight, healthy, overweight, or obese based on the following:

* obese: BMI is greater than or equal to 30
* overweight: BMI is greater than or equal to 25 but less than 30
* healthy: BMI is greater than or equal to 18.5 but less than 25
* underweight: BMI is less than 18.5

# The main steps in problem-solving

## Understand the problem
Go over the problem statement carefully and think about the desired output. The output should be one of the four categories: obese, overweight, healthy, or underweight.

## Come up with a practical solution
Choose a specific BMI value and determine the correct label. We base our decision on conditions. Since there are multiple conditions, use IF-ELSE-IF statements. The conditions mentioned in the problem can be checked in IF and ELSE-IF statements to get the desired output.

## Implement your solution
Execute the solution on different test cases. For instance, if the BMI is 31, the output should be obese.

# Pseudocode

```
INPUT bmi
IF bmi >= 30
    OUTPUT obese
ELSE-IF bmi >=25
    OUTPUT overweight
ELSE-IF bmi >=18.5
    OUTPUT healthy
ELSE
   OUTPUT underweight
```

## Explanation
We input `bmi`. Then, we use the greater than or equal operator (`>=`) to find out if `bmi` is greater than or equal to 30. If so, we output "obese." If it is not, then we check the condition inside the ELSE-IF statement. If `bmi` is greater than or equal to 25, we output "overweight." Note that the output will be "overweight" only if `bmi` is higher than 25 but less than 30. If `bmi` is not greater than or equal to 25, check the condition inside the next ELSE-IF statement. If `bmi` is greater than or equal to 18.5, the output is "healthy." If all the conditions stated above are false, the instruction in the ELSE block is executed, and the output is "underweight." Note the sequence of conditions. If `bmi` is greater than or equal to 18.5 were written first, weights in the upper ranges would also fulfill the condition, which is a logical error.

To further understand how the pseudocode works, enter a value between 0 and 100 (both values inclusive) and press **Done**:

Use IF, ELSE-IF, and ELSE statements to find the body mass index (BMI) category based on user input.

Introduction

Getting to Know Computers

Problem Solving

Variables

Decision in Programs

Repetition in Programs

Conclusion

Determine the BMI Category

Problem statement

The main steps in problem-solving

Understand the problem