invalid conversion from *void to *int [-fpermissive] using malloc(sizeof())

Question

I\'m writing a program that calculates the greatest common denominator of two numbers, but i\'m getting problem with malloc function and pointers. Actually it\'

Answer 1

You need to cast:

int *a = (int*)malloc(num * sizeof(int));

Because there's no implicit conversion from void* to type * in C++.

Note that this cast is not required in C and could potentially be dangerous to do so in C.

Except for #include <iostream>, nothing in your code is C++. So remove it and compile it with a C compiler and you wouldn't need this cast.