How to convert a byte array into double in C?

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Try this:

double a;
memcpy(&a, ptr, sizeof(double));

where ptr is the pointer to your byte array. If you want to avoid copying use a union, e.g.

union {
  double d;
  char bytes[sizeof(double)];
} u;
// Store your data in u.bytes
// Use floating point number from u.d

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