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)

Your browser does not support the canvas element which will make some the features unavailable.

If you are using Internet Explorer within the University of Exeter try going to the Settings menu (probably the gear shape at the top right of this page), selecting "Compatibility View settings", unchecking "Display intranet sites in Compatibility View" and reloading this page.

Code

 Header...
#define LENGTH 26
 struct mystruct {
  float val;
  char str[LENGTH];
};

 int main(){
   ... 

»  struct mystruct struct1, struct2;
 
»  struct1.val=3.14259;
»  strncpy(struct1.str, "This is the value of Pi!", LENGTH);

»  struct2=struct1;
»  »
»  strncpy(struct1.str, "Oops! No it isn't!", LENGTH);
»  printf("%s\n%s\n", struct2.str, struct1.str);
}

Memory

main()
				132	133	134	135
				struct1.val = -4.40284795e+33
136	137	138	139	140	141	142	143
struct1.str = 'h' 'Q' 'N' ' '				'8'	' '	' '	' '
144	145	146	147	148	149	150	151
't'	' '	' '	' '	' '	'\0'	'\0'	'\0'
152	153	154	155	156	157	158	159
' '	' '	' '	' '	' '	' '	'S'	' '
160	161	162	163	164	165	166	167
' '	'\0'	?	?	struct2.val = 2.80259693e-43
168	169	170	171	172	173	174	175
struct2.str = 'G' ' ' 'Y' ' '				'\0'	'P'	'n'	' '
176	177	178	179	180	181	182	183
' '	'\0'	'\0'	'\0'	' '	' '	'Y'	' '
184	185	186	187	188	189	190	191
'8'	' '	' '	' '	't'	' '	' '	' '
192	193
' '	'\0'

NB: the actual memory address of each variable is the
address shown plus 4289713176 (0xFFAFD418).

Show Advanced options

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

Output

This is the value of Pi!
Oops! No it isn't!

Validate Link-check