pep9
伪代码:
Set sum to0
Read num1
Set sum to sum + num1
Read num2
Set sum to sum + num2
Read num3
Set sum to sum + num3
If (sum<0)
Write"Error"
Else
Write sum
伪代码:
Set sum to0
Read num1
Set sum to sum + num1
Read num2
Set sum to sum + num2
Read num3
Set sum to sum + num3
If (sum<0)
Write"Error"
Else
Write sum