broken oven problem

idks16 (17)
there is a oven with digits from 0-9 but 1, 4, and 7 is broken. if the user entered a broken digit, the program would output the nearest number that works.

i wrote the code without using a programmer defined function: 
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 #include <iostream>
using namespace std;
int main ()
{
    int t1, d1, d2, t2, d3, d4, t3, d5, d6;
    //each t(#) is the digit input and each d(#) is +-1 from t
    char yes;
    //char used to repeat loop
    
    cout<<"You have a oven that has number pads from 0-9 but the numbers 1, 3, \n";
    cout<<"and 7 are broken.\n";
    cout<<"This program will calculate the lowest and highest temperature the\n";
    cout<<"oven can produce when a broken number is entered.\n"<<endl;
    
    //start of loop
    do
    {
    cout<<"Enter the desired temperature (with spaces between the digits):\n";
    cin>>t1>>t2>>t3;//1st digit, 2nd digit, 3rd digit

    if (t1==1)//loop for whenever the first digit is 1
    {
         d1=0;//1-0 and 1+1
         d2=2;
         cout<<d1;
         if ((t2==1)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d1<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<d2;
         //loop when 1st and 2nd digit is 1 and the 3rd digit is not a broken number 
         
         if ((t2==4)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<3<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<5;
         
         if ((t2==7)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<6<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<8;
         
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)||(t3==0))&&((t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<t2<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2;
         //loop when 1st digit is 1 and 2nd and 3rd digit is not a broken number
         
         }
    else if (t1==4)
    {
         d1=3;//4-1 and 4+1
         d2=5;
         cout<<d1;
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<t2<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2;
         //loop when 1st digit is 4 and 2nd and 3rd digit is not a broken number
         
         if ((t2==1)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<0<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<2;
         
         if ((t2==7)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<3<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<4;
         
         if ((t2==4)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d1<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<d2;
         //loop when 1st and 2nd digit is 4 and the 3rd digit is not a broken number
         
    }
    else if (t1==7)//loop for whenever the first digit is 7
    {
         d1=6;//7-1 and 7+1
         d2=8;
         cout<<d1;
         if ((t2==7)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d1<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<d2;
         //loop when 1st and 2nd digit is 7 and the 3rd digit is not a broken number
         
         if ((t2==1)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<0<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<2;
         
         if ((t2==4)&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<3<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2<<4;
         
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<t2<<t3<<" is the lowest temperature you can enter and your highest is: "<<d2;
         //loop when 1st digit is 7 and 2nd and 3rd digit is not a broken number
         
    }

    if ((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))
    cout<<t1;
    //the output of the 1st digit will be the user input when it is not a broken number
    
    //the same method used for t1 is used in t2 and t3
    if (t2==1)
    {
         d3=0;
         d4=2;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&& ((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d3<<t3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==4))
         cout<<d3<<t3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<t3;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==7))
         cout<<d3<<t3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<t3;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==1))
         cout<<d3<<d3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<d6;
    }
    else if (t2==4)
    {
         d3=3;
         d4=5;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d3<<t3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==7))
         cout<<d3<<6<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<8;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==1))
         cout<<d3<<0<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<2;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==4))
         cout<<d3<<d3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<d4;
    }
    else if (t2==7)
    {
         d3=6;
         d4=8;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9)))
         cout<<d3<<t3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==4))
         cout<<d3<<3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<5;

idks16 (17)
this is the rest of the code, it could fit in 1 message
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if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==1))
         cout<<d3<<0<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<2;
         if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&(t3==7))
         cout<<d3<<d3<<" is the lowest temperature you can enter and your highest is: "<<t1<<d4<<d4;
    }
    
    if ((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))
    cout<<t2;

    if (t3==1)
    {
         d5=0;
         d6=2;
         if ((t1==1)&&(t2==1))
         cout<<d3<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<d4<<d6;
         if ((t1==4)&&(t2==7))
         cout<<d3<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<d4<<d6;
         if ((t1==7)&&(t2==4))
         cout<<d3<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<d4<<d6;
         //when all digits are broken numbers
         
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&(t1==1))
         cout<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<t2<<d6;
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&(t1==7))
         cout<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<t2<<d6;
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&(t1==4))
         cout<<d5<<" is the lowest temperature you can enter and your highest is: "<<d2<<t2<<d6;
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<t1<<t2<<d6;
         
    }
    else if (t3==4)
    {
         d5=3;
         d6=5;
         if ((t1==4)&&(t2==4))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         if ((t1==1)&&(t2==7))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         if ((t1==7)&&(t2==1))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         //when all digits are broken numbers
if (((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9))&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<t1<<t2<<d6;
         if ((t1==4)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
         if ((t1==1)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
         if ((t1==7)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
         
    }
    else if (t3==7)
    {
         d5=6;
         d6=8;
         if ((t1==4)&&(t2==1))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         if ((t1==1)&&(t2==4))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         if ((t1==7)&&(t2==7))
         cout<<d3<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<d4<<d6;
         //when all digits are broken numbers
         
         if (((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9))&&((t1==0)||(t1==2)||(t1==3)||(t1==5)||(t1==6)||(t1==8)||(t1==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<t1<<t2<<d6;
         if ((t1==7)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
         if ((t1==1)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
         if ((t1==4)&&((t2==0)||(t2==2)||(t2==3)||(t2==5)||(t2==6)||(t2==8)||(t2==9)))
         cout<<d5<<"  is the lowest temperature you can enter and your highest is:"<<d2<<t2<<d6;
    }
    

    if ((t3==0)||(t3==2)||(t3==3)||(t3==5)||(t3==6)||(t3==8)||(t3==9))
    cout<<t3<<" is your temperature";
    
    cout<<endl<<"To repeat the program enter y:\n";
    cin>>yes;
    }while (yes=='y'||yes=='Y');
    //end of loop
    
    return 0;
}

i need to rewrite the same program using the function
 
 
bool containsDigit(int number, int digit);

if the number contains the digit, the function should be true.
but i don't know how you can find a digit in a number.[/code]
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