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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct {
  5.   char * name;
  6. } Player;
  7.  
  8. int main(void) {
  9.   char * name;
  10.   char * pname;
  11.   Player * player;
  12.  
  13.   name = "FIRST LAST";
  14.  
  15.   // initialize player
  16.   player = (Player *)malloc(sizeof(Player));
  17.   player->name = name;
  18.  
  19.   pname = player->name;
  20.  
  21.   // print information about the variables
  22.   printf("Printing Initial Variable Information:\n");
  23.   printf("--------------------------------------\n");
  24.   printf("Variable: name\n");
  25.   printf("Location: `%p'\n", &name);
  26.   printf("   Value: `%p'\n", *name);
  27.   printf("Dref Val: `%s'\n", name);
  28.   printf("\n");
  29.  
  30.   printf("Variable: pname\n");
  31.   printf("Location: `%p'\n", &pname);
  32.   printf("   Value: `%p'\n", *pname);
  33.   printf("Dref Val: `%s'\n", pname);
  34.   printf("\n");
  35.  
  36.   printf("Variable: player->name\n");
  37.   printf("Location: `%p'\n", &(player->name));
  38.   printf("   Value: `%p'\n", *(player->name));
  39.   printf("Dref Val: `%s'\n", player->name);
  40.   printf("\n");
  41.  
  42.   // see what *(pname++) is doing
  43.   printf("Checking what *(pname++) does:\n");
  44.   printf("------------------------------\n");
  45.   printf("Variable: pname\n");
  46.   printf("Location: `%p'\n", &pname);
  47.   printf("   Value: `%p'\n", *pname);
  48.   printf("Dref Val: `%s'\n", pname);
  49.   printf("\n");
  50.  
  51.   *(pname++);
  52.  
  53.   printf("Variable: pname\n");
  54.   printf("Location: `%p'\n", &pname);
  55.   printf("   Value: `%p'\n", *pname);
  56.   printf("Dref Val: `%s'\n", pname);
  57.   printf("\n");
  58.  
  59.   // see what *(player->name++) is doing
  60.   printf("Checking what *(player->name++) does:\n");
  61.   printf("-------------------------------------\n");
  62.   printf("Variable: player->name\n");
  63.   printf("Location: `%p'\n", &(player->name));
  64.   printf("   Value: `%p'\n", *(player->name));
  65.   printf("Dref Val: `%s'\n", player->name);
  66.   printf("\n");
  67.  
  68.   *(player->name++);
  69.  
  70.   printf("Variable: player->name\n");
  71.   printf("Location: `%p'\n", &(player->name));
  72.   printf("   Value: `%p'\n", *(player->name));
  73.   printf("Dref Val: `%s'\n", player->name);
  74.   printf("\n");
  75.  
  76.   // see results
  77.   printf("Printing Resulting Variable Information:\n");
  78.   printf("----------------------------------------\n");
  79.   printf("Variable: pname\n");
  80.   printf("Location: `%p'\n", &pname);
  81.   printf("   Value: `%p'\n", *pname);
  82.   printf("Dref Val: `%s'\n", pname);
  83.   printf("\n");
  84.  
  85.   printf("Variable: player->name\n");
  86.   printf("Location: `%p'\n", &(player->name));
  87.   printf("   Value: `%p'\n", *(player->name));
  88.   printf("Dref Val: `%s'\n", player->name);
  89.   printf("\n");
  90.  
  91.   return 0;
  92. }
  93.  
Success #stdin #stdout 0s 9424KB
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stdin
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Standard input is empty
stdout
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Printing Initial Variable Information:
--------------------------------------
Variable: name
Location: `0x7ffebcaae830'
   Value: `0x46'
Dref Val: `FIRST LAST'

Variable: pname
Location: `0x7ffebcaae838'
   Value: `0x46'
Dref Val: `FIRST LAST'

Variable: player->name
Location: `0x2b889fcb3010'
   Value: `0x46'
Dref Val: `FIRST LAST'

Checking what *(pname++) does:
------------------------------
Variable: pname
Location: `0x7ffebcaae838'
   Value: `0x46'
Dref Val: `FIRST LAST'

Variable: pname
Location: `0x7ffebcaae838'
   Value: `0x49'
Dref Val: `IRST LAST'

Checking what *(player->name++) does:
-------------------------------------
Variable: player->name
Location: `0x2b889fcb3010'
   Value: `0x46'
Dref Val: `FIRST LAST'

Variable: player->name
Location: `0x2b889fcb3010'
   Value: `0x49'
Dref Val: `IRST LAST'

Printing Resulting Variable Information:
----------------------------------------
Variable: pname
Location: `0x7ffebcaae838'
   Value: `0x49'
Dref Val: `IRST LAST'

Variable: player->name
Location: `0x2b889fcb3010'
   Value: `0x49'
Dref Val: `IRST LAST'
https://ideone.com/SpiJRX
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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