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Consider the following C program: ```c #include <stdio.h> void stringcopy(char *, char *); int main(){ char a[30] = "@#Hello World!"; stringcopy(a, a + 2); printf("%s\n", a); return 0; } void stringcopy(char *s, char *t) { while (*t) *s++ = *t++; } ``` Which ONE of the following will be the output of the program?

1. @#Hello World!
2. Hello World!
3. ello World!
4. Hello World!!

Correct answer: ello World!

Solution

The function copies characters from `a + 2` into `a`, so the first two characters '@#' are overwritten by 'H' and 'e', and the remaining characters shift left. Because the source and destination overlap, the resulting string becomes 'ello World!'.

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