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Lære Essentials of C Program | Introduction
C Basics

bookEssentials of C Program

Let's delve deeper into our introductory program:

Main.c

Main.c

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#include <stdio.h> // preprocessor directive int main() // the main function { printf("Hello, c<>definity!\n"); // print text return 0; // exit }

printf Function

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, like this:

printf("some text");

Control Characters

Note

In C, \n is recognized as a single character, not two separate characters ("\" and "n").

The character sequence \n represents a newline. This means that any content following this sequence will appear on the next line.

Main.c

Main.c

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12345678
#include <stdio.h> int main() { printf("Hel\nlo"); return 0; }

Throughout this course, we'll occasionally utilize the \t character for tabulation, which equates to a tab, or 4 spaces.

Main.c

Main.c

copy
12345678
#include <stdio.h> int main() { printf("Hel\tlo"); 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

return is the statement 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. While it has specific implications on UNIX systems, it generally indicates an "Exit status" or the successful termination of a program. We'll explore the return statement in greater depth as the course progresses.

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Sektion 1. Kapitel 2

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bookEssentials of C Program

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Let's delve deeper into our introductory program:

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 }

printf Function

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, like this:

printf("some text");

Control Characters

Note

In C, \n is recognized as a single character, not two separate characters ("\" and "n").

The character sequence \n represents a newline. This means that any content following this sequence will appear on the next line.

Main.c

Main.c

copy
12345678
#include <stdio.h> int main() { printf("Hel\nlo"); return 0; }

Throughout this course, we'll occasionally utilize the \t character for tabulation, which equates to a tab, or 4 spaces.

Main.c

Main.c

copy
12345678
#include <stdio.h> int main() { printf("Hel\tlo"); 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

return is the statement 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. While it has specific implications on UNIX systems, it generally indicates an "Exit status" or the successful termination of a program. We'll explore the return statement in greater depth as the course progresses.

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 2
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