8086 Assembly Level Program

Question

How do you write an 8086 assembly language program to check whether or not a given number is a strong number? Input is entered through the console.

Answer 1

Very tall order.... source code is 500+ lines, too long to list here, per gcc compiler generated assembler from Dev C++;

I know the recursion makes things very complicated, pushing and popping the function calls onto the call stack.

Writing it in C is sufficiently formidable...

-----------------------------------------------------------------

#include <stdio.h>

#include <string.h>

long factorial( int n)

{

long factorialReturn=-1;

if (n>-1)

{

if ((n==0) || (n==1))

{

factorialReturn=1;

}

else

{

factorialReturn = n * factorial(n-1);

}

}

return(factorialReturn);

}

Go()

{

int iNum=-1;

char numBuff[255];

int numDigits;

int iLoop;

int iCurDigit;

long sum=0;

while (iNum<=1)

{

printf(" Please input the number :>");

scanf("%d",&iNum);

}

sprintf(numBuff,"%d",iNum);

numDigits = strlen(numBuff);

for (iLoop=0; iLoop<numDigits; iLoop++)

{

iCurDigit = int(numBuff[iLoop]-48);

sum += factorial(iCurDigit);

}

if (sum==long(iNum))

{

printf(" %d is a STRONG # \n",iNum);

}

}

int main()

{

Go();

}