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Full Discussion: Pointer and address
Top Forums Programming Pointer and address Post 302803871 by yifangt on Tuesday 7th of May 2013 03:07:30 PM
Old 05-07-2013
Pointer and address

This code is to print out the program name and arguments list one by one:
Code:
  1 #include<stdio.h>
  2 
  3 void main(int argc, char *argv[])
  4 {
  5         int iCount = 0;
  6         while (iCount < argc) {
  7                 printf("argc:%d\t%s\n",iCount, argv[iCount]);
  8                 iCount++;
  9         }
 10 }
 11

I understand it is about pointer and pointer address of the array. Can somebody explain to me why line 7 should not be as :
Code:
printf("argc:%d\t%s\n",iCount, *argv[iCount]);

I thought *argv[iCount] is the correct way as argv[iCount] is one of the array members address, not the content of the pointer pointing to. But my understanding is wrong! What did I miss? Thanks a lot!

Last edited by yifangt; 05-07-2013 at 04:14 PM..
 

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PGACreate(8)							      PGAPack							      PGACreate(8)

NAME
PGACreate - creates an uninitialized context variable. The Fortran version of this function call contains only the last three arguments INPUT PARAMETERS
argc - address of the count of the number of command line arguments. argv - array of command line arguments. datatype - the data type used for the strings. Must be one of PGA_DATATYPE_BINARY, PGA_DATATYPE_CHARACTER, PGA_DATATYPE_INTEGER, PGA_DATATYPE_REAL, or PGA_DATATYPE_USER binary -valued, character-valued, integer-valued, real -valued, or a user-defined datatype, respectively. len - the string length (number of genes). maxormin - the direction of optimization. Must be one of PGA_MAXIMIZE or PGA_MINIMIZE for maximization or minimization, respectively. OUTPUT PARAMETERS
none SYNOPSIS
#include "pgapack.h" PGAContext * PGACreate(argc, argv, datatype, len, maxormin) int *argc char **argv int datatype int len int maxormin LOCATION
create.c EXAMPLE
Example: In C: void main(int argc, char **argv) { PGAContext *ctx; : ctx = PGACreate(&argc, argv, PGA_DATATYPE_BINARY, 100, PGA_MAXIMIZE); : // Set options here : PGASetUp(ctx); : // Run the GA here : PGADestroy(ctx); } In FORTRAN: integer ctx : ctx = PGACreate(PGA_DATATYPE_BINARY, 100, PGA_MAXIMIZE) : c Set options here : call PGASetUp(ctx) : c Run the GA here : call PGADestroy(ctx) stop end 05/01/95 PGACreate(8)
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