GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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ecvt(3) |
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ecvt, fcvt output conversion jsr pc,ecvt jsr pc,fcvt
char *ecvt(value, ndigit, decpt, sign)
double value;
int ndigit, *decpt, *sign; char *fcvt(value, ndigit, decpt,
sign)
is called with a floating point number in fr0. On exit, the number has been converted into a string of ascii digits in a buffer pointed to by r0. The number of digits produced is controlled by a global variable ndigits. Moreover, the position of the decimal point is contained in r2: r2=0 means the d.p. is at the left hand end of the string of digits; r2>0 means the d.p. is within or to the right of the string. The sign of the number is indicated by r1 (0 for +; 1 for ). The low order digit has suffered decimal rounding (i. e. may have been carried into). From C, the is converted and a pointer to a null-terminated string of ndigit digits is returned. The position of the decimal point is stored indirectly through decpt (negative means to the left of the returned digits). If the sign of the result is negative, the word pointed to by sign is non-zero, otherwise it is zero. Fcvt is identical to ecvt, except that the correct digit been rounded for F-style output of the number of digits specified by ndigits. printf (III)
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ecvt(3) | |