simple program using nested procedures in assembly language

 include irvine32.inc

.386

.stack 4096

Exitprocess proto,dwExitcode:dword

.data

str1 byte "enter first number:",0

str2 byte "enter second number:",0

num1 dword ?

num2 dword ?

sum dword ?

subt dword ?

mult dword ?

.code

main proc

call sumof

invoke Exitprocess,0

main endp

;this is the sumof function

sumof proc

call getnum

mov eax,num1

mov ebx,num2

add eax,ebx

mov sum,eax

call WriteInt

call crlf

call subof

ret

sumof endp

;this is the sumof function

subof proc

mov eax,0

mov ebx,0

call getnum

mov eax,num1

mov ebx,num2

sub eax,ebx

mov subt,eax

call WriteInt

call crlf

call mulof

ret

subof endp

;this is the sumof function

mulof proc

mov eax,0

mov ebx,0

call getnum

mov eax,num1

mov ebx,num2

mul ebx

mov mult,eax

call WriteInt

call crlf

ret

mulof endp

;this is the getnum function

getnum proc

mov edx,offset str1

call WriteString

call ReadInt

mov num1,eax

mov edx,offset str2

call WriteString

call ReadInt

mov num2,eax

call crlf

ret

getnum endp

end main