C Language String processing function

Introduction to string processing functions in C language

Here are 8 basic common string handling functions, often used in numeric arrays (partial functions). These functions are generally available 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 --function of input string

General form: gets (character array)

Function: Enter a string from the terminal into a character array, and get a function value that becomes 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);

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

Description: The character array 1 must be large enough to accommodate 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

Note: 1. You cannot directly assign a string constant or a character array directly to an array of characters using an assignment statement.

2. Use strncpy to assign a value to the specified position of the character. strncpy (str1,str2,3); copies the 3rd character in str2 to str1.

5.strcmp function --string comparison function

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

function: Used to compare the differences of two strings. have different rules for comparison.

6.strlen function --function of measuring string length

General form: strlen (character array);

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

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

The result is: 5

7.strlwr function --function converted to lowercase

General form: STRLWR (String);

8.STRUPR function --the function converted to uppercase

General form: STRUPR (String).

The above is just a simple C language commonly used functions, the shortcomings of the point of looking.

C Language String processing function