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  1. #include <iostream>
  2. using namespace std ;
  3. int m , n , t,rem, num;
  4. int main(){
  5. cout << "Enter the natural number "<< '\n' ;
  6. cin >> m ;
  7.     if (m==1 || m==2) {
  8.         cout << m << "is prime" << '\n' ;
  9.         //if cin is 1 or 2 it immediately tells me that they are prime.
  10.  
  11.     }else{
  12.     for (int i=3; i<m; i++) {
  13.         for (n=2; n<i ; n++) {
  14.                 rem=i%n ;
  15.             // for i<m the function checks the remainder of i when divided by numbers less than i.
  16.             if (rem == 0) {
  17.                 break;
  18.             }else{
  19.                  num=i ;
  20.             }
  21.             //If there is a remainder which is equal to 0 then the loop stops and goes further to check for another 'i'.
  22.             }
  23.         cout << num ;
  24.  
  25.  
  26.         }
  27.  
  28.     }
  29.  
  30.         return 0 ;
  31. }
Success #stdin #stdout 0s 3144KB
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stdin
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Standard input is empty
stdout
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Enter the natural number
https://ideone.com/fmyuzc
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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