How to convert a Double type to String type with C?

[wdshen]

Except use "sprintf" ,please tell me how to??

 

[jtm111]

DO you mean you must use sprintf, or you can't use sprintf?

If you must use sprintf:


#include <string.h>

double dbl_variable = 12.01;
char char_buffer[1024];

sprintf(char_buffer, &quot;%lf&quot;, dbl_variable);

 

[Nosferatu]

You can use the standard library functions for conversions to/from strings/numbers to/from numbers/strings... Ok, here are a set of functions:
from strings to numbers
atof, atoi, _atoi64, atol.
These functions convert strings to integers or floats. Their name comes from:
ansiitofloat,
ansiitoint,
ansiitoiint64bitslong,
ansiitolong

For the reverse conversion u can use:
itoa, fcvt (and its siblings, gcvt and ecvt)

Hope this helps. You can find the documentation for these functions on any compiler help, since they are ANSI (most of them, at least, i think).

This could be a good subject for a FAQ, actually since it is a preety common question in C.



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