Question

E2.15 In assembly code, write a program to count the number of elements in an array that are smaller than 16. The array is stored at memory locations starting from $1010. The array has 30 8-bit unsigned elements. Store the count in the memory location $C001.

Answer 1

MVI B,30 // Assign the array size to the register B

MVI C,00 // Initialize the counter

LXI H,1010 // Assign the starting address to the memory

L1: MOV A,M // Load the content of the memory location(M) to Accumulator (A)

XRI 16 // Perform XOR operation with Accumulator, if accumulator value is equal to 16 then it produces 0 in Accumulator

JZ COUNT // If the accumulator value is 0, then it jumps to the loop count

INX H // Increment the memory location if the value is not equal to 16

COUNT: INR C // Count value is increased

INX H // Increment the memory location if value is equal to 16

DCR B // Decrease the Array size after one comparison.

JNZ L1 // the control is transferred to L1

MOV A,C // once the count is done then it is stored in accumulator

STA C001 // The result stored in accumulator is stored in the memory address C001

HLT