Chapter 5.1, Problem 3E

To determine

To write: a program to check whether the given number is positive or not.

Answer to Problem 3E

Checks if the entered number is positive or negative.

Explanation of Solution

Concept used: Use different syntax that is used to PRINT, INPUT IF…ELSE and do other operations while writing required BASIC program.

BASIC program to check if the given numbers are positive or not:

10 CLC

20 LET “ $W$ =0”

30 PRINT “Enter an integer: “;

40 FOR $i=1\text{ to }5$ ;

50 IF $W>=0$

60 PRINT “Integer is Positive”

70 IFELSE $W<0$

80 PRINT “Integer is Negative”

90 RETURN 0

100 END

Here line 30, prints different messages. Line 20 sets $W$ as zero to make sure that the list is empty. Lines 50-80 check the number whether it is positive or negative. LINE 90 returns to Line 30.

Enter an integer: $30$

Integer is positive.

Enter an integer: $-31$

Integer is negative.

Conclusion: Programs checks if the entered number is positive or negative.