strdup and strndup in C/C++

strdup()

The function strdup() is used to duplicate a string. It returns a pointer to a null-terminated byte string.

Syntax

Here is the syntax of strdup() in C language,

char *strdup(const char *string);

Example

Here is an example of strdup() in C language.

#include <stdio.h>
#include<string.h>
int main() {
 char *str = "Helloworld";
 char *result;
 result = strdup(str);
 printf("The string : %s", result);
 return 0;
}

Output

The string : Helloworld

strndup()

The function strndup works similarly to the function strndup(). This function duplicates the string at most size bytes i.e. the given size in the function. It also returns a pointer to a null-terminated byte string.

Syntax

Here is the syntax of strndup() in C language,

char *strndup(const char *string , size_t size);

Example

Here is an example of strndup() in C language,

#include <stdio.h>
#include<string.h>
int main() {
 char *str = "Helloworld";
 char *result;
 result = strndup(str, 3);
 printf("The string : %s", result);
 return 0;
}

Output

The string : Hel