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NAME printing - producing formatted output
DESCRIPTION The print command and the
printf() and fprintf() functions are
used to send output to files or to the screen. In
spec, files and devices are turned on or
off using special commands (see the files help
file), and printed output generally goes to all devices that are
currently on. The fprintf() function differs
in that it turns off output to everything except the file or
device specified in its first argument.
The print command prints each of its arguments
separated by spaces, and then prints a newline. Strings are
printed as is, numbers are printed using the "%g"
format.
The functions printf(), fprintf()
and sprintf() use format specifications just like
those in C. A few of those format specifications are
%s to print a string, %g to print a
floating point number and %d to print an integer.
An embedded \n prints a newline. See the
description of printf() in a C manual for more details.
BUILT-IN COMMANDS AND FUNCTIONS
print a, b
... - Prints each argument, separated by spaces.
printf(format,
a, b ... )
- Prints
a, b, etc.
using format.
fprintf(file_name,
format [, a, ...])
- Does formatted printing on
file_name.
All other devices (except log files) are turned off while the
string is printed.
sprintf(format,
a, b ... )
- Returns a string holding the formatted print.
EXAMPLES
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1.SPEC> print sqrt(2), PI, PRINTER
1.41412 3.14159 /dev/lp
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2.SPEC> printf("Today is %s. PI = %.3g\n",\
date(), PI)
Today is Sat Jan 23 00:54:23 1988. PI = 3.14
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3.SPEC> FILENAME = sprintf("%s/data/run.%d",\
HOME, run);
4.SPEC> print FILENAME
/usr/gerry/data/run.12
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SEE ALSO
files
printf() in any C-language programming manual.
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Last Formatted May 12, 2012
Last Updated 02/28/01
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