C program

EMPS intranet

Hi! Hi! Start program

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 mychar;

»  while (1) {
  // Read a character from stdin
»    mychar=getc(stdin);
»    if (mychar==EOF) 
      return 0;

»    printf("I read: \"%c\"\n", mychar);
    // Put it back
»    ungetc(mychar, stdin);

    // Read it again!
»    mychar=getc(stdin);
»    printf("Again I read: \"%c\"\n\n", mychar);
  }

}
 ...

Memory

main()
128	129	130	131
mychar = -1767414994

NB: the actual memory address of each variable is the
address shown plus 4294442440 (0xFFF7FDC8).

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Input was:

abc

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

Output

I read: "a"
Again I read: "a"

I read: "b"
Again I read: "b"

I read: "c"
Again I read: "c"

I read: "
"
Again I read: "
"

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