Pointer arithmetic for void pointer in C

Question

When a pointer to a particular type (say int, char, float, ..) is incremented, its value is increased by the size of that data type. I

Answer 1

Compiler knows by type cast. Given a void *x:

• x+1 adds one byte to x, pointer goes to byte x+1
• (int*)x+1 adds sizeof(int) bytes, pointer goes to byte x + sizeof(int)
• (float*)x+1 addres sizeof(float) bytes, etc.

Althought the first item is not portable and is against the Galateo of C/C++, it is nevertheless C-language-correct, meaning it will compile to something on most compilers possibly necessitating an appropriate flag (like -Wpointer-arith)