Lære Printf

The printf is a function in C used to display output on the screen. It stands for print formatted and allows you to show text, numbers, or variable values in a specific format.

Main.c


              12345678910
            
#include <stdio.h>

int main() {
    // Declaring and initialization `int` type variable
	int iVariable = 832; 

	printf("iVariable = %d \n", iVariable);

	return 0;
}

The printf function is responsible for displaying formatted output on the screen. In this example, it prints both text and the value of the variable iVariable.

Format String

C language doesn't inherently possess Input/Output (I/O) capabilities. The role of the printf() function is to take your variable's value, convert its content into characters, and then replace the "%d" with them.

Format Specifiers

The %d is a format specifier that tells printf to display an integer. Specifiers act as placeholders for variable values, such as %f for floats, %c for characters, and %s for strings.

%d: for integers;
%f: for floating-point numbers;
%c: for single characters.

Main.c


              123456789101112
            
#include <stdio.h>

int main() {
    
	int iVariable = 832; // Variable of `int` type
	float fVariable = 54.984; // Variable of `float` type
	char cVariable = '#'; // Variable of `char` type

	printf("iVariable = %d \n", iVariable); // Using `%d` for integer
	printf("fvariable = %f \n", fVariable); // Using `%f` for float
	printf("cVariable = %c \n", cVariable); // Using `%c` for single character
}

Note

The \n is an escape sequence that tells the program to move to a new line when printing text.

One of the great things about the printf() function is its ability to print multiple variables simultaneously.

main.c


              123456789101112
            
#include <stdio.h>

int main() {
    
	int iVariable = 832; 
	float fVariable = 54.984; 
	char cVariable = '#'; 

	printf("iVariable = %d \n fvariable = %f \n cVariable = %c \n", iVariable, fVariable, cVariable); 

	return 0;
}

The format specifiers and the variables are paired in sequence, which allows printf to insert each variable's value into its corresponding placeholder in the correct order.

However, if you mismatch the specifier, your program will not display the data correctly:

Main.c


              12345678910
            
# include <stdio.h>

int main() {
    
  	int iVariable = 1234;
  
	printf("%f", iVariable); // `%f` - a floating point number for floats

 	return 0;
}

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 3

Spørg AI

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

Suggested prompts:

Can you explain what happens if I use the wrong format specifier in printf?

What are some common mistakes when using printf in C?

Can you show examples of correct and incorrect usage of format specifiers?

Awesome!

Completion rate improved to 2.63

Stryg for at vise menuen

The printf is a function in C used to display output on the screen. It stands for print formatted and allows you to show text, numbers, or variable values in a specific format.

Main.c


              12345678910
            
#include <stdio.h>

int main() {
    // Declaring and initialization `int` type variable
	int iVariable = 832; 

	printf("iVariable = %d \n", iVariable);

	return 0;
}

The printf function is responsible for displaying formatted output on the screen. In this example, it prints both text and the value of the variable iVariable.

Format String

Format Specifiers

%d: for integers;
%f: for floating-point numbers;
%c: for single characters.

Main.c


              123456789101112
            
#include <stdio.h>

int main() {
    
	int iVariable = 832; // Variable of `int` type
	float fVariable = 54.984; // Variable of `float` type
	char cVariable = '#'; // Variable of `char` type

	printf("iVariable = %d \n", iVariable); // Using `%d` for integer
	printf("fvariable = %f \n", fVariable); // Using `%f` for float
	printf("cVariable = %c \n", cVariable); // Using `%c` for single character
}

Note

The \n is an escape sequence that tells the program to move to a new line when printing text.

One of the great things about the printf() function is its ability to print multiple variables simultaneously.

main.c


              123456789101112
            
#include <stdio.h>

int main() {
    
	int iVariable = 832; 
	float fVariable = 54.984; 
	char cVariable = '#'; 

	printf("iVariable = %d \n fvariable = %f \n cVariable = %c \n", iVariable, fVariable, cVariable); 

	return 0;
}

The format specifiers and the variables are paired in sequence, which allows printf to insert each variable's value into its corresponding placeholder in the correct order.

However, if you mismatch the specifier, your program will not display the data correctly:

Main.c


              12345678910
            
# include <stdio.h>

int main() {
    
  	int iVariable = 1234;
  
	printf("%f", iVariable); // `%f` - a floating point number for floats

 	return 0;
}

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 3