Prev Next
strcat() function in C:
- strcat( ) function in C language concatenates two given strings. It concatenates source string at the end of destination string. Syntax for strcat( ) function is given below.
char * strcat ( char * destination, const char * source );
- Example:
strcat ( str2, str1 ); – str1 is concatenated at the end of str2.
strcat ( str1, str2 ); – str2 is concatenated at the end of str1.
- As you know, each string in C is ended up with null character (‘\0’).
- In strcat( ) operation, null character of destination string is overwritten by source string’s first character and null character is added at the end of new destination string which is created after strcat( ) operation.
Example program for strcat() function in C:
- strcat( ) function in C language concatenates two given strings. It concatenates source string at the end of destination string. Syntax for strcat( ) function is given below.
char * strcat ( char * destination, const char * source );
In this program, two strings “fresh2refresh” and “C tutorial” are concatenated using strcat( ) function and result is displayed as “C tutorial fresh2refresh”.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
#include <stdio.h> #include <string.h> int main( ) { char source[ ] = " fresh2refresh" ; char target[ ]= " C tutorial" ; printf ( "\nSource string = %s", source ) ; printf ( "\nTarget string = %s", target ) ; strcat ( target, source ) ; printf ( "\nTarget string after strcat( ) = %s", target ) ; } |
Output:
|
Source string = fresh2refresh
Target string = C tutorial Target string after strcat( ) = C tutorial fresh2refresh |
C String functions:
- String.h header file supports all the string functions in C language. All the string functions are given below.
- Click on each string function name below for detail description and example programs.
|
String functions
|
Description
|
| strcat ( ) | Concatenates str2 at the end of str1 |
| strncat ( ) | Appends a portion of string to another |
| strcpy ( ) | Copies str2 into str1 |
| strncpy ( ) | Copies given number of characters of one string to another |
| strlen ( ) | Gives the length of str1 |
| strcmp ( ) | Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2 |
| strcmpi ( ) | Same as strcmp() function. But, this function negotiates case. “A” and “a” are treated as same. |
| strchr ( ) | Returns pointer to first occurrence of char in str1 |
| strrchr ( ) | last occurrence of given character in a string is found |
| strstr ( ) | Returns pointer to first occurrence of str2 in str1 |
| strrstr ( ) | Returns pointer to last occurrence of str2 in str1 |
| strdup ( ) | Duplicates the string |
| strlwr ( ) | Converts string to lowercase |
| strupr ( ) | Converts string to uppercase |
| strrev ( ) | Reverses the given string |
| strset ( ) | Sets all character in a string to given character |
| strnset ( ) | It sets the portion of characters in a string to given character |
| strtok ( ) | Tokenizing given string using delimiter |