C – strcat() function

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  • 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:

In this program, two strings “fresh2refresh” and “C tutorial” are concatenated using strcat( ) function and result is displayed as “C tutorial fresh2refresh”.



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
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

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