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18.0 System Calls
Encapsulate system calls; do not make direct system calls that already have equivalents (R)
For Unix, for porting concerns, use the following functions in place of direct system calls. Here is a partial list.
Instead of Use
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strtod TString::scanInt()
strtol TString::scanFloat()
getenv fGetEnv
system fSystem
exit(0) fExitWithSuccess()
exit(1) fExitWithFailure()
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