Third Number

Now the program continues with the third group of statements. Say that the user enters "5":

' Ask the user for numbers.
' Add them up, print the sum.
'
LET  SUM = 0                 ' Clear the sum
'
PRINT "Enter a number"       ' First number
INPUT NUMBER                 ' User enters first number
LET   SUM = SUM + NUMBER     ' increase the SUM
'
PRINT "Enter a number"       ' Second number
INPUT NUMBER                
LET   SUM = SUM + NUMBER    
'

PRINT "Enter a number"       ' Third number
INPUT NUMBER
LET   SUM = SUM + NUMBER

'
PRINT "The total is:", SUM   ' At this point, SUM is the total of all numbers
'
END

The "5" is input into NUMBER, then it is added to SUM. So SUM ends up with 23 in it. Finally the PRINT statement prints out the answer.