Curriculum

C basic

C Home

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C Introduction

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C Get Started

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C Syntax

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C Output

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C Comments

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C Variables

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C Data Types

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C Constants

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C Operators

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C Booleans

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C If ... Else

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C Switch

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C Break and Continue

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C While Loop

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C For Loop

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C Arrays

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C Strings

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C User Input

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C Memory Address

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C Pointers

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C Functions

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C Files

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C Structures

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C Enums

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C Memory

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Text lesson

Real Life Examples

Real-Life Examples

This example illustrates how you can employ if…else to “unlock a door” when the user inputs the correct code:

Example

int doorCode = 1337;

if (doorCode == 1337) {
printf(“Correct code.\nThe door is now open.”);
} else {
printf(“Wrong code.\nThe door remains closed.”);
}

This example demonstrates how you can utilize if…else to determine whether a number is positive or negative:

Example

int myNum = 10; // Is this a positive or negative number?

if (myNum > 0) {
printf(“The value is a positive number.”);
} else if (myNum < 0) {
printf(“The value is a negative number.”);
} else {
printf(“The value is 0.”);
}

Determine if an individual meets the legal age requirement to vote:

Example

int myAge = 25;
int votingAge = 18;

if (myAge >= votingAge) {
printf(“Old enough to vote!”);
} else {
printf(“Not old enough to vote.”);
}

Determine whether a number is even or odd.

Example

int myNum = 5;

if (myNum % 2 == 0) {
printf(“%d is even.\n”, myNum);
} else {
printf(“%d is odd.\n”, myNum);
}