On the string processing function _c language of C language

Here are 8 basic common string-handling functions that are often used in numeric arrays (partial functions). These functions are generally provided in all C-language compilation systems.

1,puts function --function of output string

The general form is puts (string group)

Function: Outputs a string to the terminal. For example, char a string and give the initial value. Call puts (string), and the output of the string.

2,gets function --the function of the input string

General form: gets (character array)

Function: Enter a string from the terminal to the character array, and get a function value to become the starting address of the character array.

Gets (str);

Keyboard input,,,, you know.

Note: The puts and gets functions can only output or enter a string.

3,strcat function --string connection function

General form: strcat (character array 1, character array 2);

Role: Concatenate strings in two string arrays and concatenate string 2 to the back of string 1.

Description: Character array 1 must be large enough to hold the new string after the connection.

4,strcpy/strncpy function --string copy function

General form: strcpy (character array 1, string 2);

Function: Copy the string 2 to the character array 1.

such as: Char str1[10],str2[]= "Dongteng";

strcpy (STR1,STR2);

The result after execution is: you know

Attention:

1. An assignment statement cannot be used directly to give a string constant or an array of characters directly to an array of characters.

2. A character that can assign a value to a specified position with strncpy. strncpy (str1,str2,3); copies the 3rd character in the str2 to str1.

5,strcmp function --string comparison function

General form: strcmp (String 1, string 2);

Role: Used to compare the differences between two strings. have different comparison rules.

6,strlen function --the function of measuring string length

General form: strlen (character array);

such as: Char str[10]= "Dongteng";

printf ("%d", strlen (str));

The results obtained are: 5

7,strlwr function --Convert to lowercase functions

General form: STRLWR (String);

8,STRUPR function --converted to uppercase function

General form: STRUPR (String).

The above is just simple C language commonly used functions, deficiencies also look at.

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