begginer

[cry4you]

this is the task: Given two positive integers m and n. Determine the number m n last digit sum. Sharing the figure should be quantified.

the result is worng and i cant find mistake. When i use "/"everything is ok but with out quant its wrong

#include <iostream>
using namespace std;
int main ()
{
    int   m,n,k,j=0,sum2=0,sum,sum1=0;


    cout<<"ievadiet skaitli M: \n";
    cin>>m;
    
      cout<<"ievadiet skaitli N: \n";
    cin >>n;


   for (int  i=0; i<=n; i++)
   {
      sum=m%10;
      
          sum1=sum1+sum;
       
do
      {      
m=m-10;
j++;     
 m=j;
      }
      while (m>=10);
         
//m=m/10;

      
}     

  cout<<sum1<<endl;

    
    system("pause");
    return 0;
}

[jsmith]

Huh?

Are you saying you want to calculate the sum of the last 'n' digits of 'm'?

[cry4you]

yes.

for example if i enter m=12345 and n=3 the he count 5+4+3

[jRaskell]

http://cplusplus.com/forum/beginner/15171/

In that thread I posted some code that would sum up all the numerical characters in a given string. It's just a matter of modifying the loop to handle your scenario.