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Ok if you have yahoo message me, otherwise:
Oh think I found the error.
before your while statement, initialize the number by :

int number = 0, sum = 0, numamount = 0; // You can change the...

Oh duh, I fail fix it to look like
while(number>-1)

Oh I've seen that error. Do this instead for the while loop

while(input>-1)

Ok heres a hint.

For your while loop, your going to want it to look something around


int number, sum, numamount; // You can change the variable names.
while(input>=0)
{ // Begin while...