How can I input more than one digit numbers on my calculator I made?

Questions & Answers
1

I made a calculator and everything works fine, I just don’t know how I would make it able to do more than one digit numbers. Can you please help me out? Here is the code:

using UnityEngine;
using System.Collections;

    public class Calculator : MonoBehaviour {
    
    	string asmd = ""; //Addition, subtraction...
    	int num1 = 0;
    	int num2 = 0;
    	int answer = 0;
    	bool num1chosen = false;
    
    	void OnGUI() {
    		GUI.Box(new Rect(10, 10, 370, 315), "");
    		GUI.Box(new Rect(15, 15, 80, 30), "" + num1);
    		GUI.Box(new Rect(100, 15, 50, 30), "" + asmd);
    		GUI.Box(new Rect(155, 15, 80, 30), "" + num2);
    		GUI.Box(new Rect(240, 15, 50, 30), "=");
    		GUI.Box(new Rect(295, 15, 80, 30), "" + answer);
    		if(GUI.Button(new Rect(15, 50, 80, 50), "7")) {
    			if(num1chosen == false) {
    			  num1 = 7;
    			}
    			else {
    			  num2 = 7;
    			}
    		}
    		if(GUI.Button(new Rect(100, 50, 80, 50), "8")) {
    			if(num1chosen == false) {
    			  num1 = 8;
    			}
    			else {
    			  num2 = 8;
    			}
    		}
    		if(GUI.Button(new Rect(185, 50, 80, 50), "9")) {
    			if(num1chosen == false) {
    			  num1 = 9;
    			}
    			else {
    			  num2 = 9;
    			}
    		}
    		if(GUI.Button(new Rect(15, 105, 80, 50), "4")) {
    			if(num1chosen == false) {
    			  num1 = 4;
    			}
    			else {
    			  num2 = 4;
    			}
    		}
    		if(GUI.Button(new Rect(100, 105, 80, 50), "5")) {
    			if(num1chosen == false) {
    			  num1 = 5;
    			}
    			else {
    			  num2 = 5;
    			}
    		}
    		if(GUI.Button(new Rect(185, 105, 80, 50), "6")) {
    			if(num1chosen == false) {
    			  num1 = 6;
    			}
    			else {
    			  num2 = 6;
    			}
    		}
    		if(GUI.Button(new Rect(15, 160, 80, 50), "1")) {
    			if(num1chosen == false) {
    			  num1 = 1;
    			}
    			else {
    			  num2 = 1;
    			}
    		}
    		if(GUI.Button(new Rect(100, 160, 80, 50), "2")) {
    			if(num1chosen == false) {
    			  num1 = 2;
    			}
    			else {
    			  num2 = 2;
    			}
    		}
    		if(GUI.Button(new Rect(185, 160, 80, 50), "3")) {
    			if(num1chosen == false) {
    			  num1 = 3;
    			}
    			else {
    			  num2 = 3;
    			}
    		}
    		if(GUI.Button(new Rect(15, 215, 165, 50), "0")) {
    			if(num1chosen == false) {
    				num1 = 0;
    			}
    			else {
    				num2 = 0;
    			}
    		}
    		if(GUI.Button(new Rect(185, 215, 80, 50), "AC")) {
    			num1 = 0;
    			num2 = 0;
    			answer = 0;
    			asmd = "";
    			num1chosen = false;
    		}
    		if(GUI.Button(new Rect(15, 270, 360, 50), "=")) {
    			if(asmd == "+") {
    				answer = num1 + num2;
    			}
    			else if(asmd == "-") {
    				answer = num1 - num2;
    			}
    			else if(asmd == "*") {
    				answer = num1 * num2;
    			}
    			else if(asmd == "/") {
    				answer = num1 / num2;
    			}
    		}
    		if(GUI.Button(new Rect(270, 50, 105, 50), "+")) {
    			asmd = "+";
    			num1chosen = true;
    		}
    		if(GUI.Button(new Rect(270, 105, 105, 50), "-")) {
    			asmd = "-";
    			num1chosen = true;
    		}
    		if(GUI.Button(new Rect(270, 160, 105, 50), "*")) {
    			asmd = "*";
    			num1chosen = true;
    		}
    		if(GUI.Button(new Rect(270, 215, 105, 50), "/")) {
    			asmd = "/";
    			num1chosen = true;
    		}
    	}
    }
2

Let say you have answere 737

then try this

int _ans = 737; // put your answere here 
int digit;
int lastDigit;

int i=0;
while(Math.abs(_ans) >0){
     digit= _ans%10;
    _ans = _ans/10;

     digitArray*= digit;   // here you can collect digit into array or some other data structure*

i++; // digits would be in reverse order
if(_ans <10 ) _ans =0;
print(digit);
}