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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 ellipse {
  float centre[2];
  float axes[2];
  float orientation;
  float area;
}Ellipse;

#define PI 3.14159265358979


 int main(){
   ... 

»  Ellipse *e=NULL;

»  e=malloc(sizeof *e);
»  if (e==NULL) {
»    fprintf(stderr, "Out of memory\n");
»    exit(99);
  }

»  e->orientation=PI/4;

»  printf("Orientation: %g\n", e->orientation);
»  return 0;

}
Memory

Allocated memory

128
129
130
131
132
133
134
135
128.centre[0] = 3.20433e-09
128.centre[1] = -5.71844e+07
136
137
138
139
140
141
142
143
128.axes[0] = -0.169598
128.axes[1] = 3.07833e-25
144
145
146
147
148
149
150
151
128.orientation = -7.07997567e+24
128.area = 4.30395931e-39

main()

280
281
282
283
e = NULL

NB: the actual memory address of each variable is the
address shown plus 4290354208 (0xFFB99C20).

The actual address of allocated memory is the
address shown plus 142365272 (0x87C5258).

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Output

Orientation: 0.785398
                                                                                                                                                                                                                                                                       
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