C program

EMPS intranet

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...
 struct foo {
  float mass;
  float pos[2];
  float v[2];
  char *name;
};

 int main(){
   ... 

»  struct foo wilber[2];
»  struct foo *w;

»  w=wilber;

»  scanf("%g", &wilber[1].mass);
»  scanf("%g", &w->pos[0]);
»  scanf("%g %g", &wilber[1].pos0, &wilber[1].pos1);
»  printf("Here: %g %g\n", wilber[1].pos0, wilber[1].pos1);

»  return 0;
}

Memory

main()
128	129	130	131	132	133	134	135
w = -4158131212				wilber[0].mass = 1.40129846e-45
136	137	138	139	140	141	142	143
wilber[0].pos[0] = -nan				wilber[0].pos[1] = -4.55955e+33
144	145	146	147	148	149	150	151
wilber[0].v[0] = 1.4013e-45				wilber[0].v[1] = 2.8026e-43
152	153	154	155	156	157	158	159
wilber[0].name = -142016161				wilber[1].mass = -5.09468776e+33
160	161	162	163	164	165	166	167
wilber[1].pos[0] = 1.4013e-45				wilber[1].pos[1] = -4.66401e+33
168	169	170	171	172	173	174	175
wilber[1].v[0] = 3.99934e-34				wilber[1].v[1] = 3.99925e-34
176	177	178	179
wilber[1].name = -4292669927

NB: the actual memory address of each variable is the
address shown plus 4292669928 (0xFFDCF1E8).

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Input was:

2.4 5.61 7.92
2.4 5.61 7.92

Show output (Before looking at the output, work out what you think it put should be and see if you are right.)

Output

Here: 7.92 2.4

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