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5
Indexable
Never
.model small

.data
array db 5 dup(00)
m1 db 10,13, "Enter 5 Subject Marks $"

sum dw 0000h   ;sum variable 00 (16Bit)

m2 db 10,13, "Failed $"
m3 db 10,13, "C Grade $"
m4 db 10,13, "B Grade $"
m5 db 10,13, "A Grade $"

.code
mov ax,@data   ; Initialize the data seg address
mov ds,ax

mov ah,09h
lea dx,m1   ; Display message
int 21h

mov ch, 05  ; set Counter

mov si, offset array ;pointing memory location to store

X3:
call accept   ; PC pushes address of next instr on top of the stack
mov [si], bl    ; transfer data to that location pointed by si
mov bh, 00h  
add sum, bx

;add bl, [si]

inc si
dec ch
JNZ X3       ; unless ZF is not set jump to accept proc


mov ax, sum ;Divident Must be in a AX reg
mov bl, 05h   ;5 subject marks thats why we wrote 5
div bl

;remainder = ah quotient = al

cmp al, 40h
JBE N1  ;Jump if BELOW or EQUAL

cmp al, 60h
JBE N2

cmp al, 80h
JBE N3

cmp al, 90h
JBE N4


N1:
mov ah, 09h
lea dx, m2
int 21h
jmp exit

N2:
mov ah, 09h
lea dx, m3
int 21h 
jmp exit

N3:
mov ah, 09h
lea dx, m1
int 21h 
jmp exit 

N4:
mov ah, 09h
lea dx, m5
int 21h 
jmp exit  

exit:
mov ah,4ch
int 21h


accept proc near

mov ah,01h   ; ascii code goes in to AL(0 to F)
int 21h

mov bl, al    ; make free al
sub bl, 30h   ; seperate the accepted no forms ascii code
cmp bl, 09h   ; if single digit is >9 then need to sub 07h
JLE X1          ; bl=5 bl=50    bl=50+8 = 58
sub bl,07h            ;bh = 8

X1:
mov cl, 04h      ; create tens place value for 2 digit no
SHL bl,cl

mov ah,01h      ; second no.accept (0-F) unit value
int 21h

mov bh, al
sub bh,30h

cmp bh,09h
JLE X2

sub bh, 07h
X2:
add bl, bh    ; two digit no is created      
                                                           
                                                           
ret      ;pop the next instruction address from the stack  
endp
end