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Hi!   Hi!           Start main()

Try stepping through the code


  Value and type of last evaluated expression: Address of array element: Address of array elementx:  (none)

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Code

 Header...

typedef struct wotsit {
  float val;
  char *str;
  int length;
}Wotsit;


 Wotsit* newWotsit(int len){
   ... 

»  Wotsit *w;

»  w=xmalloc(sizeof *w);

»  w->length=len;
»  w->val=0;
»  w->str=xmalloc(w->length);
»  return w;

}

 int main(){
   ... 

»  Wotsit *william;

»  william=newWotsit(20);
»  snprintf(william->str, william->length, 
    "Hello, world\n");
»  return 0;

}
Memory

Allocated memory

128
129
130
131
132
133
134
135
128.val = 2.16466616e+19
128.str = 2933299065
136
137
138
139
128.length = 1490917

144
145
146
147
148
149
150
151
'V' ' ' ' ' ' ' '%' 'D' ' ' ' '
152
153
154
155
156
157
158
159
' ' ' ' 'M' ' ' ' ' ' ' ' ' ' '
160
161
162
163
'I' ' ' ' ' '\0'

newWotsit()

296
297
298
299
300
301
302
303
w = 376
?
?
?
?
336
337
338
339
len = 20

main()

360
361
362
363
william = -4290332847

NB: the actual memory address of each variable is the
address shown plus 4290332848 (0xFFB948B0).

The actual address of allocated memory is the
address shown plus 153371224 (0x9244258).

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