If malloc returns void * then what does the new operater returns when it encounters a failure ?

Question

Also please tell me if you could describe how the variable will react with the operations and how can I detect that a failure has occurred ?

Answer 1

If something goes wrong, it will return a null pointer:

int *p;

if((p = (int*)malloc(25*sizeof(int)) == NULL) {
// something went wrong
}

Answer 2

the new operator indicates failure by throwing an exception of type "std::bad_alloc" unless “nothrow” is used, in which case it returns a nullptr :
https://code.sololearn.com/c3aw8gUs5i5w/#cpp

Answer 3

Thanks for your help