Strcat and strncat

String library functions starting with 'str' cannot process string overlaps.

* Strcat (* s1, ** strncat (* s1, * s2, size_t n );

When strcat connects s1 and s2, the s1 Terminator '\ 0' is replaced by the first character of s2, and all characters of s2 (including its terminator) all are covered in the corresponding positions of s1;

Strncat connects up to n characters of s2 to s1. If n is less than or equal to the length of s2, an ending character '\ 0' is added to the final result'

If n is longer than s2, strncat and strcat are functionally consistent.

Test code

 

Main (argc, ** a [] = B [] = c [] = I = (; I <; printf (, a [I]), I ++ ); printf (strncat (a, B,); (I =; I <; printf (, a [I]), I ++); printf (

Output