Does sizeof(float) always equal to sizeof(int) on all architectures?

Question

I'm seeing code allocating memory for float using sizeof(int).
I'm wondering whether sizeof(float) always equal to sizeof(int) on all architectures?

float *pointer2Float = (float *) USER_DEFINED_MALLOC (...,..., sizeof(int))

Note: this USER_DEFINED_MALLOC isa wrapper for conventional malloc, I think.

Thanks

Regards

Answer 1

No, there are implementations (mainly embedded systems) with 16-bit int and 32-bit float.

And of course, the sizes are allowed to be quite different per the standard.

Answer 2

The sizes of ALL types (except char, signed char and unsigned char¹) are implementation-defined. So it is not guaranteed that sizeof(float) will be equal to sizeof(int) on all platforms.

^{1. The size of char and all its variants is defined to be 1-byte by the Standard. However, the number of bits in 1-byte is implementation-defined!}