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C

Learn the foundation of programming.

1

Hello World

C uses printf() for output. Include <stdio.h> for standard I/O.

Example

Run this example to see how it works and then try the exercise.

example.c
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Output
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Exercise

Your task: Use printf() to print "Hello, World!"

main.c
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Output
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Quiz

What does stdio.h stand for?

SUMMARY

In this section, you learned how to print output to the console. Next, you’ll learn how to declare variables and work with different data types.

2

Variables and Data Types

C has basic types. Use format specifiers in printf.

Example

Run this example to see how it works and then try the exercise.

example.c
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Output
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Exercise

Your task: Declare age (int), height (float), grade (char)

main.c
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Output
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Quiz

Which format specifier is used for integers in C?

SUMMARY

In this section, you learned how to declare variables and work with different data types. Next, you’ll learn how to use constants for values that don’t change.

3

Constants

Constants are values that cannot change. Use const or #define.

Example

Run this example to see how it works and then try the exercise.

example.c
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Output
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Exercise

Your task: Calculate area using PI * radius * radius

main.c
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Output
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Quiz

Which keyword creates a constant variable in C?

SUMMARY

In this section, you learned how to use constants for values that don’t change. Next, you’ll learn how to perform mathematical operations.

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Locked lessons:
  • Arithmetic Operators
  • If-Else Statements
  • For Loops
  • While Loops
  • Functions
  • Arrays
  • Pointers
  • Structs
  • Final Project: Student Grade System
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