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Full Discussion: #define in c
Top Forums Programming #define in c Post 302516537 by gaurav1086 on Sunday 24th of April 2011 03:32:19 AM
Old 04-24-2011
Bug

Quote:
Originally Posted by laopi
Hi,

I had a head file, looks like
#define MIN_NUM 10
#define MAX_NUM 10

is there any way to get "MAX_NUM" from 10?

thanks.

peter
Hi Peter,

A preprocessor directive such as you see "#define" or "#include" is translated by the preprocessor (cpp) before the compiler gets its hands dirty with the code. For example if you write,

#define NUM 5

Then every instance of NUM gets replaced by "5" before the code is compiled. The compiler knows nothing about what NUM is so you cannot use a logic to get NUM from 5.

My question is why would you want NUM which is a variable from 5 which is constant. You can only do the reverse that is get the constant from a variable.

Thanks and Regards,
Gaurav.
 

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TRACEROUTE(1)                                                      User Commands                                                     TRACEROUTE(1)

NAME
traceroute - Trace the route to a host SYNOPSIS
traceroute [OPTION...] HOST DESCRIPTION
Print the route packets trace to network host. -f, --first-hop=NUM Set initial hop distance, that is the time-to-live. -g, --gateways=GATES List of gateways for loose source routing. -I, --icmp Use ICMP ECHO as probe. -m, --max-hop=NUM Set maximal hop count (default is 64). -M, --type=METHOD Use METHOD (icmp or udp) for traceroute operations, defaulting to udp. -p, --port=PORT Use destination PORT port (default is 33434). -q, --tries=NUM Send NUM probe packets per hop (default is 3). --resolve-hostnames Resolve hostnames. -t, --tos=NUM Set type of service (TOS) to NUM. -w, --wait=NUM Wait NUM seconds for response (default is 3). -?, --help Give this help list. --usage Give a short usage message. -V, --version Print program version. GNU inetutils 2015-05-15 TRACEROUTE(1)
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