I am trying to run this program in Visual Studio 2017. I keep getting this build error: error MSB8036: The Windows SDK version 8.1 was not found. Install the required version of Windows SDK or change the SDK version in the project property pages or by right-clicking the solution and selecting "Retarget solution". 1>Done building project "ConsoleApplication2.vcxproj" -- FAILED.

#include

#include

#include

#include

using namespace std;

void showChoices()

{

cout << " MAIN MENU" << endl;

cout << "1: Addition " << endl;

cout << "2: Subtraction" << endl;

cout << "-1: Quit the program " << endl;

cout << "Enter your choice :";

}

long add(long a, long b)

{

return a + b;

}

long subtract(long a, long b)

{ if(a>b)

return (a - b);

else

return (b - a);

}

int main()

{

long x, y,dc=1,d=0,nc=0,t;

int choice;

char ch[5]={'a','b','c','d','e'},ch1;

int option[4];

string username,filename,date;

bool flag=false;

ofstream myReadFile;

int dlevel,i=0,nch=0,index,attempt=0;

cout<<"Eneter User Name:";

cin>>username;

//cout<<"Eneter file Name:";

//cin>>filename;

cout<<"Eneter the Date:";

cin>>date;

filename.append(".txt");

myReadFile.open("score.txt");

cout<<"Enter Difficulty Level:";

cin>>dlevel;

while(i

{

dc*=10;

i++;

}

myReadFile<<"name:"<

while(1)

{

showChoices();

x=rand()%dc+1;

y=rand()%dc+1;

cin.clear();

fflush(stdin);

cin >> choice;

if(!((choice>=1&&choice<=2)))

break;

switch (choice)

{

case 1:

cin.clear();

fflush(stdin);

for(i=0;i<4;i++)

option[i]=rand()%(dc);

index=rand()%4;

option[index]=add(x,y);

cout<<"Sum(X+Y) of"<

for(i=0;i<4;i++)

cout<<" ("<

cout<<" (e)Non of the Above";

while(!flag&&attempt<3)

{

cout<<" Enter you Choice: ";

cin>>ch1;

for(i=0;i<4;i++)

if(ch[i]==ch1)

break;

if(i==index)

{

d++;

cout<<" Congrats Correct choice";

flag=true;

}

attempt++;

}

if(attempt==3)

nc++;

attempt=0;flag=false;

if(i==index)

myReadFile<<"Sum(X+Y) of"<

else

myReadFile<<"Sum(X+Y) of"<

break;

case 2:

attempt=0;

cin.clear();

fflush(stdin);

flag=false;

for(i=0;i<4;i++)

option[i]=rand()%(dc-d+1)+d;

index=rand()%4;

option[index]=subtract(x,y);

if (x

{

t=x;

x=y;

y=t;}

cout<<"Subtraction of"<

for(i=0;i<4;i++)

cout<<" ("<

cout<<" (e)Non of the Above";

while(!flag&&attempt<3)

{

cout<<" Enter you Choice: ";

cin>>ch1;

for(i=0;i<4;i++)

if(ch[i]==ch1)

break;

if(i==index)

{

d++;

cout<<" Congrats Correct choice";

flag=true;

}

attempt++;

}

if(attempt==3)

nc++;

attempt=0;flag=false;

if(i==index)

myReadFile<<"Subtraction of"<

else

myReadFile<<"Subtraction of"<

break;

default:

cout << "Invalid input" << endl;

}

}

myReadFile<<"Correct Answer:"<

myReadFile.close();

return 0;

}