strncpy() - Manipulation Function
How to copy specified number of characters in C++?
Explanation
strncpy() is used to copy upto the characters specified in the "count" from string 2 to 1. This manipulation function returns a pointer to string 1.
char * strncpy ( char * str1, const char * str2, size_t count );
Result :
Data copied from str2 to str1 using strncpy: Sou
In the above example, strncpy() manipulation function copies first three characters from "str2" to "st1". Since the size of str1 is "5", null is added to the end.
Pre-conditions for using strncpy():
- str2 must be a pointer to a null terminated string.
- If str2 has less than the count, nulls will be appended to str1.
- If str2 has more than the number, str1 will not be null treminated.
Syntax:
char * strncpy ( char * str1, const char * str2, size_t count );
Example :
| #include <stdio.h> #include <cstring.h> int main () { char str1 [5]; char str2 []="Source string"; strncpy (str1,str2,3); printf ("Data copied from str2 to str1 using strncpy: %s", str1); return 0; } |
Result :
Data copied from str2 to str1 using strncpy: Sou
In the above example, strncpy() manipulation function copies first three characters from "str2" to "st1". Since the size of str1 is "5", null is added to the end.
