std::strncat

char *strncat( char *dest, const char *src, std::size_t count );

Appends a byte string pointed to by src to a byte string pointed to by dest. At most count characters are copied. The resulting byte string is null-terminated.

The destination byte string must have enough space for the contents of both dest and src plus the terminating null character, except that the size of src is limited to count.

The behavior is undefined if the strings overlap.

Parameters

Return value

dest.

Notes

Because strncat needs to seek to the end of dest on each call, it is inefficient to concatenate many strings into one using strncat.

Example

#include <cstring>
#include <cstdio>
 
int main() 
{
    char str[50] = "Hello ";
    char str2[50] = "World!";
    std::strcat(str, str2);
    std::strncat(str, " Goodbye World!", 3);
    std::puts(str);
}

Hello World! Go

See also