atof() — Convert Character String to Float For the atof() function, digits is one or more decimal digits; if no digits appear before the decimal
The decimal digits can precede an exponent, introduced by the letter e or E The exponent is a decimal integer, which might be signed The atof() function
30 nov 1990 · metic to perform correctly rounded decimal-to-binary conversion machines where strtod returns the correctly rounded value and atof is
(atof string) Arguments 3 Engineering (feet and decimal inches) Convert the value of x to a string in decimal format, with 2 decimal places:
7 oct 2021 · significatifs en décimal contre 7 avec les float) Description La fonction atof() convertit le début de la chaîne pointée par nptr en un
L'ordinateur reconnaît les constantes rationnelles au point décimal ou au séparateur de l'exposant ('e' ou 'E') printf("double = f \n", atof(STR));
atof double atof(const char *nptr) number of decimals printed for floating-point values (e, E, and f), Optionally signed decimal integer value
23 jan 2018 · l'exposant est introduit par la lettre e ou E (nombre décimal éventuellement signé) atof : conversion de String `a double
9 oct 2021 · atof -- ascii to floating jsr r5, atof; subr atof will convert an ascii stream to a floating decimal possibly·preceded by a- sign
Hex-decimal Integer Constant atof Convert a string to a double Debug functions: Name Description debug Show the output to the debug window
![[PDF] subr atof will convert an ascii stream to a floating number returned in](https://pdfprof.com/EN_PDFV2/Docs/PDF_6/23689_6man31.pdf.jpg "[PDF] subr atof will convert an ascii stream to a floating number returned in")
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11/3/71
NAME
SYNOPSIS
ATOF (III)
atof --ascii to floating jsr r5, atof; subr atof will convert an ascii stream to a floating number returned in frO. The subroutine subr is called on r5 for each character of the stream. subr should return the character in rO. The first character not used in the conversion is left in ro. The floating point simulation should be active in either floating or double mode, but in single precision integer mode. kept in /etc/liba.a fptrap
The subroutine subr should not disturb any reqis
ters. ken
11 /3/71
NAME
SYNOPSIS
(III) atoi ascii to integer jsr rS,atoi; subr -atoi will convert an ascii stream to a binary number returned in mq. The subroutine subr is called on rS for each character of the ascii stream. §Ubr should return the character in rO. The first character not used in the conversion is left in ro. kept in /etc/liba.a
The subroutine subr should not disturb any regis
ters. ken
11/3/71
NAME
SYNOPSIS
(III) ctime convert date and time to ASCII (move time to AC-MQ) mov $buffer,r0 jsr pc, ctime
The buffer is 15 characters
long. The time has the format
Oct 9 17:32:24
The input time is in the AC and MQ registers
in the form returned by time. kept in /etc/liba.a ptime, to print time; sys time
The time is not taken modulo 1 year. (Jan 1
comes out Dec 32.) Also, the clock is only a couple of years. dmr
11/3/71
NAME
SYNOPSIS
ER
EXP (III)
exp exponential function jsr rS, exp
The exponential of frO is returned in frO. The
floating point simulation should be active in either floating or double mode, but in single precision integer mode. kept in /etc/liba.a fptrap Large arguments will cause an overflow fault from the floating point simulator. ken
11/3/71
SThOPSIS
BUGS (III) fptrap --floating point sys 33.; fptrap fptrap is a prograrr designed to pick up illegal instruction in order to simulate a sub-set of the
11/45 floating point hardware.
kept in /etc/liba.a as, PDP-11/45 manual none, hardware gives no diagnostics.
The simulation, if unsuccessful for any reason
gives an lOT fault from inside the simulator.
This should be handeled better.
ken, dmr )
11/3/71
NAME
SYNOPSIS
,,
FTOA (III)
ftoa floating to ascii conversion jsr rS, ftoa; subr will convert the floatin9 point nurrber in frO into ascii in the form
The floating point simulator should be active in
either floating or double mode, but in single integer mode. For each character generated by ftoa, the subroutine subr is called on register rS with the character in rO. kept in /etc/liba.a fptrap
The subroutine subr should not disturb any regis
ters. ken
1113171
NAME
SYNOPSIS
FILES
SEE getw, getc, fopen mov jsr $filename,r0 r5, fopen; iobuf jsr rS,getc; iobuf (character in rO) jsr rS,getw; iobuf (word in rO)
GETW, GETC, (III)
buffered input
These routines are used to provide a buffered
input facility. iobuf is the address of a
134(10) byte buffer area whose contents are main
tained by these routines. lts format is: ioptr: • =. +2 . =. + 2 • =. + 2 .=.+128.
I file descriptor
I characters left in buffer
I ptr to next character
I the buffer
fo2en should be called ·initially to open the file. On return, the error bit (c-bit) is set if the open failed. If fopen is never called, £et will read from the standard input file. Btl£ ret.urns the .next byte from the file in rO.
The error bit is set on end of file or a read
error. oetw returns the next w6rd in rO. aetc and may be used alternately; there are problems. lobuf must be provided by the user; it must be on a word boundary. kept in /etc/liba.a sys open, sys read; putc, putw, fcreat c-bit set on EOF or error for greater speed, the buffer should be 512 bytes long. Unfortunately, this will cause several existing programs to stop working. -· dmr
11/3/71
f NAME
SYNOPSIS
(III) itoa integer to ascii conversion jsr r 5, i toa; subr itoa will convert the number in rO into ascii decimal possibly·preceded by a-sign. For each character generated by itoa, the subroutine £Ubr is called on register rS with the character in ro. kept in /etc/liba.a
Tht subroutine subr should not disturb any regis
ters. ken
11/3/71
NAME
LOG (I II)
log logarithm base e jsr rS, log
The logarithm base e of frO is returned in frO.
The floating point simulation sr.ould be active in either floating or double mode, but in single precision integer mode. kept in /etc/liba.a fptrap
The error bit (c-bit) is set if the input argu
ment is less than or equal to zero. ken
11/3/71
NANE
FILES
SEE ALSO
OWNER
MESG (III)
mesg write message on typewriter jsr rS,mesg; (Now is the time\O); .even mesg writes the string immediately following its call onto the standard output file. The string is terminated by a 0 byte. kept in /etc/liba.a, standard output file ken,
11/3/71
NAME
SYNOPSIS
FILES
SEE (III) ptime print date and time (move time to ac-mq) mov file.rO jsr pc.ptime prints the date and time in the form
Oct 9 17:20:33
on the file whose file descriptor is in rO. The string is 15 characters long. The time to be printed is placed in the AC ann MQ registers in the form returned by ~i~e. kept in /etc/lita.a sys time. ctime (used to do the conversion) see ctime dmr. ken
1113171
NAME
SYNOPSIS
OWNER
PUTC, FCREAT, FLUSh (III)
putc, putw, fcreat, flush buffered output mov $filename,r0 jsr rS,fcreat; iobuf (get byte in rO) jsr rS,putc; iobuf (get word in rO) j sr r 5, putw; iobuf jsr rS,flush; iobuf fcreat creates the file (mode 17) ann sets up the buffer ,!ohuf (size 134(10) hytes); put£ and .QUtw write a byte or word respectivE!ly onto the file; flush forces the contents of the buffer to be written, but does not close the file. The format of the buffer is: iobuf: • =. +2 I file descriptor • =· +2 I characters unused in buffer • =. + 2 I ptr to next free character .=.+128. I buffer f Cf.§...q_t; sets the error bit ( c-bi t) if tr1e file creation failen; none of the other routines re turn error information.
Before terminating, a program shouln call flusb
force out the last of the output.
The user must supply iohuf, which heryir,
a word bounrlary. kept in·letclliba.R sys creat; sys writP; getc, getw, fopen error bit possible on call buffers should be changed to 512 bytes. dmr
11/3/71
SYNOPSIS
FILES
SEE ALSO
S
0\\NER.
SIN, COS (I I I)
sin, cos --sine cosine jsr rS,sin (cos) The sine (cosine) of frO (radians) is rP.tnrnE:d in frO. The .floating point simulation shoul(l be active in either floctting or double but in single precision integer All floating registers are useo. kept in /etc/liba.a fptrap
Size of the argument shoulrt be checked to mbk0
sure the result is meaningful. ken, drnr
11/3/71 SWITCE (III)
NAME switch switch on value
SYNOPSIS (switch value in rO)
jsr rS,switch; sWtab (not-found return) ••• swtab: val1; lab1;
DESCRIPTION
ER ... valn; labn •• ; 0 switch compares the value of rO against each of the vali; if a match is found, control is transferred to the corresponding lab. (after pop pinq the stack once). If no match been found by the time a null labi occurs, switch returns. kept in /etc/liba.a ken, drnr