C – strcpy() function

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strcpy( ) function in C:

  • strcpy( ) function copies contents of one string into another string. Syntax for strcpy function is given below.
    char * strcpy ( char * destination, const char * source );
  • Example:
    strcpy ( str1, str2) – It copies contents of str2 into str1.
    strcpy ( str2, str1) – It copies contents of str1 into str2.
  • If destination string length is less than source string, entire source string value won’t be copied into destination string.
  • For example, consider destination string length is 20 and source string length is 30. Then, only 20 characters from source string will be copied into destination string and remaining 10 characters won’t be copied and will be truncated.

Example program for strcpy( ) function in C:

In this program, source string “fresh2refresh” is copied into target string using strcpy( ) function.


source string = fresh2refresh
target string =
target string after strcpy( ) = 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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