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Full Discussion: Pointer and address
Top Forums Programming Pointer and address Post 302803879 by hanson44 on Tuesday 7th of May 2013 03:31:25 PM
Old 05-07-2013
Quote:
Can somebody explain
Suppose you had "int int_array [12]". Then "int_array [n]" would be an int.

argv is declared as "char *argv []" So "argv [n]" is a "char *".

"char *" is what "printf %s" expects and what makes sense, because you are trying to print a string.

"argv [iCount]" is the content of an array slot. The content happens to be an address, because "char *" is an address.

Suppose "argv [1]" is "123456". Then "*argv [1]" is '1', the single character 1. You could do an experiment and change the code to the following and verify this (untested).

Code:
printf("argc:%d\t%c\n",iCount, *argv[iCount]);

The basic answer is that argv[iCount] is compatible with %s and *argv[iCount] is compatible with %c.
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START_PVMD(3PVM)						  PVM Version 3.4						  START_PVMD(3PVM)

NAME
pvm_start_pvmd - Starts new PVM daemon. SYNOPSIS
C int info = pvm_start_pvmd( int argc, char **argv, int block ) Fortran call pvmfstartpvmd( args, block, info ) PARAMETERS
argc Number of arguments in argv. argv An array of arguments to the executable. args A character string containing the arguments to the executable. args A character string containing the arguments to the executable. block Integer specifying whether to block until startup of all hosts complete or return immediately. info Integer returning the error code. DESCRIPTION
The routine pvm_start_pvmd starts up a pvmd3 process, the master of a new virtual machine. It returns as soon as the pvmd is started and ready for work. If the block parameter is nonzero and a hostfile is passed to the pvmd as a parameter, it returns when all hosts marked to start have been added. pvm_start_pvmd returns zero on success. If PVM is compiled to allow running more than one pvmd per host, a task calling pvm_start_pvmd before any other pvm functions will connect to the pvmd that it starts. pvm_start_pvmd sets environment variable PVMSOCK to the address printed by the pvmd as it starts up. EXAMPLES
C: static char *argv[] = { "-d41", "/u/jones/pvmd_hosts", }; argc = 2 info = pvm_start_pvmd( argc, argv, block ); Fortran: CALL PVMFSTART_PVMD( '-d41 /u/jones/pvmd_hosts', BLOCK, INFO ) EXAMPLES
C: static char *argv[] = { "-d41", "/u/jones/pvmd_hosts", }; argc = 2 info = pvm_start_pvmd( argc, argv, block ); Fortran: CALL PVMFSTART_PVMD( '-d41 /u/jones/pvmd_hosts', BLOCK, INFO ) ERRORS
The following error conditions can be returned PvmDupHost A pvmd is already running. PvmSysErr The local pvmd is not responding. SEE ALSO
pvm_addhosts(3PVM), pvmd3(1PVM) pvmd3(1PVM) 11 December, 1995 START_PVMD(3PVM)
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