Question

C++

Write a program that asks user to input three positive integers one at a time, then compute and output the largest entered number. Use if-else statements for three integer comparison and use for loops for a user validation.

Example output:

Enter an integer: -7

Invalid! Number must be positive.

Enter an integer: -2

Invalid! Number must be positive.

Enter an integer: 5

Enter an integer: 7

Enter an integer: 1

Largest number: 7

Answer 1

For loops are used or all the variables separately and they will run till user enters positive value of the variables.

After all the input are valid then using if else statements the largest of three numbers are found out and printed.

Editable Code:

# include <iostream>

using namespace std;

int main(){
   int a, b, c, i; //Declaring variables
   cout << "Enter an integer. ";
   cin >> a;
   for(i=0;a<=0;i++){ //Run loop till user enters positive value of a
       cout <<"Invalid! Number must be positive.\n";
       cout << "Enter an integer. ";
       cin >> a;  
   }
   cout << "Enter an integer. ";
   cin >> b;
   for(i=0;b<=0;i++){ //Run loop till user enters positive value of b
       cout <<"Invalid! Number must be positive.\n";
       cout << "Enter an integer. ";
       cin >> b;  
   }
   cout << "Enter an integer. ";
   cin >> c;
   for(i=0;c<=0;i++){ //Run loop till user enters positive value of c
       cout <<"Invalid! Number must be positive.\n";
       cout << "Enter an integer. ";
       cin >> c;  
   }
  
   //Finding the largest
   if(a>=c && a>=b){       //If a is the largest
       cout << "Largest number: "<<a;
   }
   else if (b>=a && b >= c ){//If b is the largest
       cout <<"Largest Number: "<<b;  
   }
   else {                   //If c is the largest
       cout<<"Largesr Number: "<<c;
   }
      
return 0;
}

Hope this helps
If you have any doubt feel free to comment
Thank You!!