Averaging 3 integers

Question

My assignment is to fix the code. I have my edited code below and the original code below that. I figure I still have a few errors in here. My error checking doesnt seem to w

Answer 1

A few issues:

1. You should be using '9' and '0', since you want the ASCII values for digit '9' (0x39) and '0' (0x30), not 0x9 and 0x0.

if ( (c>'9') || (c<'0') ) { 

2. != has higher precedence than =, so you need parens. Learn operator precedence, and if you're in doubt, use parens:

3. getchar is a function not a variable.

while ((c = getchar()) != '\n') { 

4.  You use the wrong conversion. num is a double, so you would need %f. Or, you could make num a int.

printf("Please input number %f: ", num);

5. You never actually use c in any way (except error checking). You always return 0 or num (see your else clause), which makes no sense. The else body of the original is correct.