let oneTwo=False, operandOne=0, operandTwo=0,oper;
let text1=document.querySelector("#text1");
let b0=document.querySelector("#b0");
let b1=document.querySelector("#b1");
let b2=document.querySelector("#b2");
let b3=document.querySelector("#b3");
let bToch=document.querySelector("#bToch");
let bPlu=document.querySelector("#bPlu");
b0.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=0;
}
else{
operandOne+='0';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=0;
operandTwo+='';
}
else{
operandTwo+='0';
}
text1.value=operandTwo;
}
}
b1.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=1;
operandOne+='';
}
else{
operandOne+='1';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=1;
operandTwo+='';
}
else{
operandTwo+='1';
}
text1.value=operandTwo;
}
}
b2.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=2;
operandOne+='';
}
else{
operandOne+='2';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=2;
operandTwo+='';
}
else{
operandTwo+='2';
}
text1.value=operandTwo;
}
}
b3.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=3;
operandOne+='';
}
else{
operandOne+='3';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=3;
operandTwo+='';
}
else{
operandTwo+='3';
}
text1.value=operandTwo;
}
}
b4.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=4;
operandOne+='';
}
else{
operandOne+='4';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=4;
operandTwo+='';
}
else{
operandTwo+='4';
}
text1.value=operandTwo;
}
}
b5.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=5;
operandOne+='';
}
else{
operandOne+='5';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=5;
operandTwo+='';
}
else{
operandTwo+='5';
}
text1.value=operandTwo;
}
}
b6.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=6;
operandOne+='';
}
else{
operandOne+='6';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=6;
operandTwo+='';
}
else{
operandTwo+='6';
}
text1.value=operandTwo;
}
}
b7.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=7;
operandOne+='';
}
else{
operandOne+='7';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=7;
operandTwo+='';
}
else{
operandTwo+='7';
}
text1.value=operandTwo;
}
}
b8.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=8;
operandOne+='';
}
else{
operandOne+='8';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=8;
operandTwo+='';
}
else{
operandTwo+='8';
}
text1.value=operandTwo;
}
}
b9.onclick=function(){
if(oneTwo==False){
if(operandOne==0){
operandOne+=9;
operandOne+='';
}
else{
operandOne+='9';
}
text1.value=operandOne;
}
else if(oneTwo==True){
if(operandTwo==0){
operandTwo+=9;
operandTwo+='';
}
else{
operandTwo+='9';
}
text1.value=operandTwo;
}
}
bToch.onclick=function(){
if(oneTwo==False){
operandOne+='.';
text1.value=operandOne;
}
else if(oneTwo==True){
operandTwo+='.';
text1.value=operandTwo;
}
}
bPlu.onclick=function(){
oneTwo=True;
text1.value="+";
oper="plu";
}
bMin.onclick=function(){
oneTwo=True
text1.value="-";
oper="min";
}
bPro.onclick=function(){
oneTwo=True
text1.value="*";
oper="pro";
}
bCha.onclick=function(){
oneTwo=True
text1.value="/";
oper="cha";
}
bRes.onclick=function(){
switch(oper){
case "plu":
res=+operandOne+ +operandTwo;
break;
case "min":
res=+operandOne- +operandTwo;
break;
case "pro":
res=+operandOne* +operandTwo;
break;
case "cha":
if(operandTwo!=0){
res=+operandOne/ +operandTwo;
}
else{res="Error"
}
break;
}
text1.value=res;
operandOne=res;
operandTwo=0;
}