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...
 int main(int argc,char *argv[]){
   ... 


»  if (argc>=0) 
    printf("Welcome to \"%s\"\n", argv0);

»  for ( int i=1;i<argc; ++i) {
»    float val;
»    printf("Argument %d: \"%s\"\n", i, argvi);
»    if (sscanf(argvi, "%g", &val)>0) 
      printf("\tthe value is %g\n", val);
  }

»  return 0;
}

Memory

main()
				132	133	134	135
				argv = 604
184	185	186	187
argc = 5

main(): for()
				140	141	142	143
				i = 1
: for() {...}
144	145	146	147
val = 21
: for() {...}
144	145	146	147
val = 1234567.75
main(): for() {...}
144	145	146	147
val = -nan
: for() {...}
144	145	146	147
val = -nan

				604	605	606	607
				argv[0] = 3093
608	609	610	611	612	613	614	615
argv[1] = 3100				argv[2] = 3106
616	617	618	619	620	621	622	623
argv[3] = 3109				argv[4] = 3119
3088	3089	3090	3091	3092	3093	3094	3095
?	?	?	?	?	'.'	'/'	'm'
3096	3097	3098	3099	3100	3101	3102	3103
'a'	'i'	'n'	'\0'	'h'	'e'	'l'	'l'
3104	3105	3106	3107	3108	3109	3110	3111
'o'	'\0'	'2'	'1'	'\0'	'1'	'2'	'3'
3112	3113	3114	3115	3116	3117	3118	3119
'4'	'5'	'6'	'7'	'.'	'7'	'\0'	'w'
3120	3121	3122	3123	3124
'o'	'r'	'l'	'd'	'\0'

NB: the actual memory address of each variable is the
address shown plus 4287643848 (0xFF9040C8).

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

Output

Welcome to "./main"
Argument 1: "hello"
Argument 2: "21"
	the value is 21
Argument 3: "1234567.7"
	the value is 1.23457e+06
Argument 4: "world"

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Try stepping through the code

Code

main()

main(): for()

: for() {...}

: for() {...}

main(): for() {...}

: for() {...}

Output