Question

int main( ){    
    char a[2];
    char *p;
    p=&a[0];
    *(p+5)='g';
}

In the above program I defined a pointer pointing to char array but the array is 3 bytes only. Let me tell you more clearly,for instance let us assume the char array address is 1000 so it takes upto 1003 bytes, but using a pointer I am storing an ASCII value of ‘g’ at 1005 location. Is that okay with the compiler ? Is that memory an static alloacted one ? or Can be used again ? Will that value be permanently stored in it or no?

Answer 1

You are changing a random memory location in your program. This is undefined behavior and it could have random effects on your program such as a segmentation fault.