ecvt(), fcvt(), gcvt() - convert floating-point number into a string
#include <stdlib.h>
char *ecvt(double value, int ndigit, int *decpt, int *sign)
char *fcvt(double value, int ndigit, int *decpt, int *sign)
char *gcvt(double value, int ndigit, char *buf)
These three routines convert floating-point numbers (the argument value) into null-terminated strings. In ecvt(3) and gcvt(3), the ndigits argument determines the number of significant digits, though it is limited by the precision of a double; in fcvt(3), it determines the number of digits after the radix point.
The ecvt(3) function converts the value into a string. Unless value is actually zero, the high-order digit is non-zero, and the low-order digit is rounded. The radix character is not returned as part of the string, but its position is stored in decpt argument, relative to the beginning of the string. If the value stored in the decpt argument is negative, the radix character is to the left of the returned string. The value stored in sign indicates whether the result is negative: if it is non-zero, then the result is negative.
The fcvt(3) is nearly identical, but the meaning of ndigits is slightly different. Here it specifies the number of digits desired after the radix point.
The gcvt(3) function converts value into a particular format, generally similar to the one specified by %g in printf(3). The returned character will contain a radix character and will start with a minus sign if the value is negative. If possible, gcvt(3) will convert the number to the appropriate number of significant digits (equivalent to %f), but will use scientific notation (equivalent to %e) if necessary.
The ecvt(3) and fcvt(3) functions return a pointer to a null-terminated string.
The gcvt(3) function returns buf.
printf()
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@systemmanager.forsenergy.ru to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.