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1. Escape character\ t.

Code snippet 1:

# includeint main () {printf ("c:\ test\ test.c"); return 0;}

"\" and "t" form an escape character "\ t".

Escape character: changes the original meaning.

two。 Escape character\ n.

Code snippet 2:

# includeint main () {printf ("ab\ ncd"); return 0;}

The combination of "\" and "n" changes the original meaning, the meaning of line change.

3. Escape character\?

Write more than one? To prevent them from being parsed into three-letter words.

Code snippet 3:

# includeint main () {printf ("(are you ok??)") ; / /?) --]-three-letter word}

The old compiler?) Will be parsed into].

Code snippet 4:

# includeint main () {printf ("(are you ok\?)") ; return 0;}

Output result:

(are you ok)

The old compiler outputs the result:

(are you ok)

4. Escape character\'.

Used to represent character constants.

Code snippet 5:

# includeint main () {printf ("% c\ n",'a'); return 0;}

Output result:

A

Code snippet 6:

# includeint main () {printf ("% c\ n",''); return 0;}

The two single quotation marks of the output statement of this code are wide by one unit number. The first two single quotation marks are considered to be single quotation marks in a pair of single quotation marks, and the last one is left alone. Add a\ to escape (\') before the single quotation mark, and it is no longer a pair of single quotation marks with a single quotation mark but with this transfer character.

Code snippet 7:

# includeint main () {printf ("% c\ n",'\'); return 0;}

Output result:

'

5. Escape character\'.

Used to represent double quotation marks inside a string.

Code snippet 7:

# includeint main () {printf ("% c\ n", "\"); return 0;}

Output result:

''

6. Escape character\,\ t.

\\ is used to represent a backslash to prevent it from being interpreted as an escape sequence.

Code snippet 8:

# includeint main () {printf ("c:\\ test\\ test.c"); return 0;}

Output result:

Because\ t is a transfer character that cannot be printed, adding a\ becomes\\ test.

\ t is a horizontal tab (keyboard tapkey).

Code snippet 9:

# includeint main () {printf ("c:\ test\ test.c"); return 0;}

Output result:

7. Escape characters\ a,\ b,\ f,\ n,\ r,\ v.

\ a warning character (beep)

\ b backspace character

\ F Feed character

\ nWrap

\ r enter

\ v Vertical tab character

8. Escape character\ ddd

Three d represents one to three octal digits. Such as\ 130X

Code snippet 10:

# includeint main () {printf ("% c\ n",'\ 130'); return 0;}

Output result:

How much is the octal 130 in decimal?

What about the decimal 130?

Code snippet 11:

# includeint main () {printf ("% c\ n",'\ 101'); / / A-ASCII value is 65, octal is 101 return 0;} 9. Escape character\ xdd.

Dd represents two hexadecimal digits. For example:\ x300

Code snippet 12:

# includeint main () {printf ("% c\ n",'\ x30'); return 0;}

Output result:

10. Exercise to find the length of a string

Code snippet 13:

# includeint main () {printf ("% d\ n", strlen ("c:\ test\ 328\ test.c"); return 0;}

The length of the code string is 14.

"c:\ t e s t\ 328\ t e s t. C"

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