Chapter 4, Problem 32E

Explanation of Solution

MARIE code:

The following code is to evaluate the given expression “$\text{A×B+C×D}$”. The address the program code starts with “100”.

100 AB, Load B/Load the B value

101 Skipcond 800/Check the B value with condition

102 Jump CD/Jump to CD label

103 Subt One/Subtract One from the B

104 Store B/Store B value

105 Clear/Clear the register

106 Load ProdAB/Load the ProdAB label

107 Add A/Add A value

108 Store ProdAB/Store the resultant values

109 Jump AB/Jump to AB label

10A CD, Load D/Load the D value with CD label

10B Skipcond 800/Check the D value with condition

10C Jump Total/Jump to the Total label

10D Subt One/Subtract one from it

10E Store D/Store the value of D

10F Clear/Clear the value of registers

110 Load ProdCD/Load the ProdCD label

111 Add C/Add the C value into it

112 Store ProdCD/Store the resultant values

113 Jump CD/Jump to the CD label

114 Total, Clear/Initialize the Total label

115 Add ProdAB/Add to the ProdAB value

116 Add ProdCD/Add to the ProdCD value

117 Halt/Terminate the program

118 one, Hex 0001/Initialize the One value

119 A, Hex 0003/Initialize the A value

11A B, Hex 0005/Initialize the B value

11B C, Hex 0004/Initialize the C value

11C D, Hex 0006/Initialize the D value

11D ProdAB, Hex 0000  /Initialize the ProdAB value

11E ProdCD, Hex 0000  /Initialize the ProdCD value

Explanation:

From above code, the hexadecimal address is mentioned for line number in program but it is not used in software environment