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C Basics

bookEssentials of C Program

You've explored the main components of a C program's structure, but there's so much more beneath the surface.

Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> // Preprocessor directive

int main() // The main function
{
	printf("Hello, c<>definity!\n"); // Print text

	return 0; // Exit
}

The printf() function displays output on the screen. For our example, it shows the message "Hello, c<>definity!". Text meant for display should be wrapped in double quotes.

printf("some text");

Escape Characters

Escape characters are special sequences in C that start with a backslash (\) and represent non-printable or special characters within strings. They allow you to format text in ways that can't be done with regular characters

Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> 

int main() 
{
	printf("Hel\nlo");

	return 0;
}
Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> 

int main() 
{
    // Try out different escape characters
	printf("Hello");
	return 0;
}

The Semicolon

The semicolon ; signifies the end of a statement in C. Every statement in C should conclude with a ;. Think of it like the period at the end of a written sentence.

The Return Statement

The return is statement that used to end a function and potentially return a value. In the context of the main function, the standard in C requires the use of return 0. It generally indicates an Exit status or the successful termination of a program.

question mark

Which of the following statements about the structure and behavior of a simple C program is correct?

Select the correct answer

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Sektion 1. Kapitel 2

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You've explored the main components of a C program's structure, but there's so much more beneath the surface.

Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> // Preprocessor directive

int main() // The main function
{
	printf("Hello, c<>definity!\n"); // Print text

	return 0; // Exit
}

The printf() function displays output on the screen. For our example, it shows the message "Hello, c<>definity!". Text meant for display should be wrapped in double quotes.

printf("some text");

Escape Characters

Escape characters are special sequences in C that start with a backslash (\) and represent non-printable or special characters within strings. They allow you to format text in ways that can't be done with regular characters

Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> 

int main() 
{
	printf("Hel\nlo");

	return 0;
}
Main.c

Main.c

copy

              
12345678

            
#include <stdio.h> 

int main() 
{
    // Try out different escape characters
	printf("Hello");
	return 0;
}

The Semicolon

The semicolon ; signifies the end of a statement in C. Every statement in C should conclude with a ;. Think of it like the period at the end of a written sentence.

The Return Statement

The return is statement that used to end a function and potentially return a value. In the context of the main function, the standard in C requires the use of return 0. It generally indicates an Exit status or the successful termination of a program.

question mark

Which of the following statements about the structure and behavior of a simple C program is correct?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 2
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