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Escape Sequences in C

In C programming language, there are 256 numbers of characters in character set. The entire character set is divided into 2 parts i.e. the ASCII characters set and the extended ASCII characters set. But apart from that, some other characters are also there which are not the part of any characters set, known as ESCAPE characters.

List of Escape Sequences

a    Alarm or Beep   
    Backspace
f    Form Feed

    New Line

    Carriage Return
	    Tab (Horizontal)
v    Vertical Tab
\    Backslash
'    Single Quote
"    Double Quote
?    Question Mark
ooo  octal number
xhh  hexadecimal number
    Null

Some coding examples of escape characters

// C program to illustrate
// a escape sequence
#include <stdio.h>
int main(void)
{
    printf("My mobile number "
          "is 7a8a7a3a9a2a3a4a0a8a");
    return (0);
}

Output:

My mobile number is 7873923408.
// C program to illustrate
//  escape sequence
#include <stdio.h>
int main(void)
{
    //  - backspace character transfers
    // the cursor one character back with 
    // or without deleting on different 
    // compilers.
    printf("Hello GeeksF");
    return (0);
}

Output:



The output is dependent upon compiler.
// C program to illustrate
// escape sequence
#include <stdio.h>
int main(void)
{
    // Here we are using , which
    // is a new line character.
    printf("Hello ");
    printf("GeeksforGeeks");
    return (0);
}

Output:

Hello
GeeksforGeeks
// C program to illustrate
// escape sequence
#include <stdio.h>
int
main(void)
{
    // Here we are using , which is
    // a horizontal tab character.
    // It will provide a tab space 
    // between two words.
    printf("Hello GFG");
    return (0);
}

Output:

Hello   GFG

The escape sequence “ ” is very frequently used in loop based pattern printing programs.

// C program to illustrate
// v escape sequence
#include <stdio.h>
int main(void)
{
    // Here we are using v, which
    // is vertical tab character.
    printf("Hello friends");
  
    printf("v Welcome to GFG");
  
    return (0);
}

Output:

Hello Friends
Welcome to GFG
// C program to illustrate escape 
// sequence
#include <stdio.h>
int main(void)
{
    // Here we are using , which
    // is carriage return character.
    printf("Hello fri ends");
    return (0);
}

Output: (Depend upon compiler)

ends 
// C program to illustrate \(Backslash)
// escape sequence to print backslash.
#include <stdio.h>
int main(void)
{
    // Here we are using ,
    // It contains two escape sequence 
    // means and .
    printf("Hello\GFG");
    return (0);
}

Output: (Depend upon compiler)

HelloGFG 

Explanation : It contains two escape sequence means it after printing the the compiler read the next as as new line character i.e. , which print the GFG in the next line

// C program to illustrate ' escape
// sequence/ and " escape sequence to
// print single quote and double quote.
#include <stdio.h>
int main(void)
{
    printf("' Hello Geeks ");
    printf("" Hello Geeks");
    return 0;
}

Output:

' Hello Geeks
" Hello Geeks
// C program to illustrate
// ? escape sequence
#include <stdio.h>
int main(void)
{
    // Here we are using ?,  which is 
    // used for the presentation of trigraph
    // in the early of C programming. But
    // now we don't have any use of it.
    printf("??! ");
    return 0;
}

Output:

??!
// C program to illustrate OOO escape sequence
#include <stdio.h>
int main(void)
{
    // we are using OOO escape sequence, here 
    // each O in "OOO" is one to three octal 
    // digits(0....7).
    char* s = "A725";
    printf("%s", s);
    return 0;
}

Output:



A:5

Explanation : Here 000 is one to three octal digits(0….7) means there must be atleast one octal digit after and maximum three.Here 072 is the octal notation, first it is converted to decimal notation that is the ASCII value of char ‘:’. At the place of 72 there is : and the output is A:5.

// C program to illustrate XHH escape 
// sequence
#include <stdio.h>
int main(void)
{
    // We are using xhh escape sequence.
    // Here hh is one or more hexadecimal
    // digits(0....9, a...f, A...F).
    char* s = "Bx4a";
    printf("%s", s);
    return 0;
}

Output:

BJ

Explanation : Here hh is one or more hexadecimal digits(0….9, a…f, A…F).There can be more than one hexadecimal number after x. Here, ‘x4a’ is a hexadecimal number and it is a single char. Firstly it will get converted into decimal notation and it is the ASCII value of char ‘J’. Therefore at the place of x4a, we can write J. So the output is BJ.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



This article is attributed to GeeksforGeeks.org

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