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I do "#include <stdlib.h>" at the top of the source.
Example compilation:
/usr/bin/colorgcc -std=c99 -fgnu89-inline -g -Wall -I/usr/include -I./ -I../ -I../../ -I../../../ -I../../../../ -O3 -o f8 f8.c
In file included from f8.c:7:
ctype-cmp.c: In function ‘randomized’:
ctype-cmp.c:48: warning: implicit declaration of function ‘random’
ctype-cmp.c: In function ‘main’:
ctype-cmp.c:153: warning: implicit declaration of function ‘srandom’
ais@xcalibur:t$
When I turn off -std=c99, the function isfinite() can not be found. So I do want to use -std=c99 for this and other reasons. Is there some trick I'm missing?
911
DESCRIPTION The rand() function returns a pseudo-random integer in the range 0 to RAND_MAX inclusive (i.e., the mathematical range [0, RAND_MAX]). The srand() function sets its argument as the seed for a new sequence of pseudo-random integers to be returned by rand().
The rand function, declared in stdlib. h, returns a random integer in the range 0 to RAND_MAX (inclusive) every time you call it. On machines using the GNU C library RAND_MAX is equal to INT_MAX or 231-1, but it may be as small as 32767.
C++ Random Number Between 0 And 1 We can use srand () and rand () function to generate random numbers between 0 and 1. Note that we have to cast the output of rand () function to the decimal value either float or double.
man srandom says that the function is not part of C99 but part of POSIX.
Activate _BSD_SOURCE or _XOPEN_SOURCE >= 500 or any other suitable feature test macro that declares the srandom/random function (see man feature_test_macros and man srandom).
This one has good chances, but you need to figure out the macros that are defined/not defined implicitly thereby too by reading the manpages above.
/usr/bin/colorgcc -std=c99 -D_XOPEN_SOURCE=600 -fgnu89-inline -g -Wall
-I/usr/include -I./ -I../ -I../../ -I../../../ -I../../../../ -O3 -o f8 f8.c
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