Having difficulty printing strings

Question

When I run the program, the second printf() prints string2 with whatever was scanned into string1 attached to the end.

e.g.

Answer 1

A string is a null terminated char array in C.

Change

char string2[4]={'1','2','a','b'};

to

char string2[5]={'1','2','a','b', '\0'};

(which is the same as char string2[] = "12ab";)