Pointers to one type may be converted to pointers to another type. A pointer to an object may be converted to a pointer to an object whose type requires less or equally strict storage alignment and back again without change.

In many situations, void pointers are preferred; pointers to type void are pointers that point to a value that has no type, this allows void pointers to point to any data type. However in C++ (unlike in C) conversions from pointers to any type to pointers to type void require an explicit conversion.

The code below got compiled on an Intel Core i7 with the MSVC Compiler:

#include <stdio.h>

int main()
{
    const double d = 371564759.278651;

    // Pointers of different type have the same size:
    // 8 bytes on a 64-bit platform.
    printf("\n%u", (unsigned int)sizeof(double*)); // 8
    printf("\n%u", (unsigned int)sizeof(char*));   // 8
    printf("\n%u", (unsigned int)sizeof(void*));   // 8

    // Pointer conversions do not affect result
    printf("\n%f", *(double*)(char*)&d);  // 371564759.278651
    printf("\n%f", *(double*)(void*)&d);  // 371564759.278651
    printf("\n%f", *(double*)(float*)&d); // 371564759.278651
    printf("\n%f", *(double*)(long*)&d);  // 371564759.278651

    return 0;
}

References:
[1] Brian W. Kernighan and Dennis M. Ritchie. The C Programming Language, Second Edition.