byte array to double

Question

I have a four byte char array and I want to convert it to double. How can I achieve this in C.

That entirely depends on what your four byte char array represents. Is it an integer? A fixed-point number? A floating-point number? In what format? — caf
– caf, Commented Aug 31, 2010 at 5:50

wallyk · Accepted Answer · 2010-08-31 06:04:02Z

2

float and double are so closely related in C that an explicit conversion is probably not needed. However, it would be necessary for transmission to another system, or to match a data format specification. This will do what you ask:

union {
    char   c [4];
    float  f;
} x;
double d;

memcpy (x.c, character_source, sizeof x.c);
d = x.f;

answered Aug 31, 2010 at 6:04

wallyk

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