I have an array of uint64_t values uint64_t *data; in where I need to store 4 different data types: int,char*, bool, float. I solved every type by simple casting to (uint64_t), but it doesn`t work for float:

float val = 1.5f;
uint64_t var = (uint64_t) val;
printf("%.1f", (float) var); // prints 1.0

Is there a way to move data between variables on even lower level than casts? I've tried to combine casts in every way but the result was 0.0 or 1.0.

CodePudding user response：

... to store float value in uint64_t variable ...

Copy it.

float var_f = 1.5f;
uint64_t var_u64;
_Static_assert(sizeof var_f <= sizeof var_u64, "Wide float");
memcpy(&var_u64, &var_f, sizeof var_f);

To recover

memcpy(&var_f, &var_u64, sizeof var_f);
printf("%g\n", var_f);