hints for hw 4

1
hints for hw 4

• Must be able to read both integers and floats.
  What is the best data type for this (you do not
  want to lose information)?

2
/This program will read a float using scanf then
read a char using getchar(). / /Use it to
experiment mixing and matching scanf and
getchar() / /You may want to add more
variables, or use constructs to skip certain
input. / include ltstdio.hgt int main()
float answer 0 char oper ' '
while(1) printf("Enter your data
") scanf("f", answer) oper
getchar() printf("answer f, oper
'c'\n", answer, oper) return 0
3
notes on CTRL-C

• CTRL-C is not EOF. You DO NOT have to test for a
  CTRL-C character. CTRL-C will kill the DOS
  window where your program runs. Try it on one
  you've written so far.
• Remember we used CTRL-C in class to break out of
  an infinite loop. Essentially, that is what you
  will use it for here too - to break out of an
  infinite loop like while(1)

4
hw algorithm (needs refinement)

• Within your outermost loop while (1) (iterates
  once per expression) you need to do the
  following
• read your first operand (hint could assign it to
  answer)
• while an illegal character hasn't been entered
  and you don't have a new line, you'll be looking
  for your valid operators, ,-,/,
• if you have one then you'll
• read in a new number then update your answer by
  the operator (e.g. Answer Operand )
• Check for divide by zero
• when you get a new line you'll have to print the
  answer
• or an illegal character flush the rest of the
  line with the code given on the assignment's web
  page.
• Of course you must then go back to reading in
  your first operand, etc.