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  1. #include<iostream>
  2.  
  3. int main()
  4. {
  5.   double n;
  6.   std::cout << "Enter a positive real number: ";
  7.   do
  8.   {
  9.     std::cin >> n;
  10.     if(n <= 0) std::cout<<"The number must be positive, enter again: ";
  11.   }while(n <= 0);
  12.  
  13.   n *= 10000;
  14.   int Integer = n;
  15.  
  16.   int i = 4;
  17.   int sum = 0;
  18.   while(i--)
  19.   {
  20.     sum += (Integer%10);
  21.     Integer /= 10;
  22.   }
  23.   std::cout << "The sum of the first 4 digits is: " << sum;
  24.  
  25.   return 0;
  26. }
  27.  
Success #stdin #stdout 0s 4436KB
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stdin
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5.1010
stdout
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Enter a positive real number: The sum of the first 4 digits is: 2
https://ideone.com/PevZgn
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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