//division using functions resolves  divide by 0
#include <iostream>
#include <iomanip>
using namespace std;

    int t[15];
    int u[15];
    void fn();
    void fn1();
    void fn2();
    void fn3();
    void fn4();
    int calc();
    void print_to_r_1();
    void print_to_r_2();
    void print_to_r_3();
    void print_to_r_4();
 
   int n1(int a,int b);
   int r1(int b, int n_1);
   int n2(int b, int r_2 );
   int r2(int b, int n_2 , int r_1);
   int n3(int r_1, int r_2);
   int r3(int r_1, int n_1,int r_2);
   int n4(int r_2,int r_3);
   int r4(int r_2,int n_4,int r_3);
   int n5(int r_3, int r_4);
   int r5(int r_3,int n_5, int r_4 );
      
  int k,y;
  int n_1,n_2,n_3,n_4,n_5;
  int r_1,r_2,r_3,r_4,r_5;
  int *p;
  int a,b,h;
 
  int p_a, p_b, p_k, p_y, p_o_1;
  int p_n_1, p_n_2,p_n_3,p_n_4,p_n_5;
  int p_r_1, p_r_2, p_r_3,p_r_4,p_r_5;
  int o_1=1;
    
int main()
{
     calc();
}

int calc(){
     while(h<100){
     cin >> a >> b;
     cout << "a    " << a << "\n";
     cout << "b    " << b << "\n";
     n1(a,b);
     cout << "n_1  "  << n_1 << endl;
     r1(b,n_1);
     cout << "r_1  " << r_1 << endl;
     n2(b,r_1);
     cout << "n_2  " << n_2 << endl;
     r2(b, n_2, r_1);
     cout << "k    " << k <<  endl;
     cout << "y    " << y << endl;
     n3(r_1,r_2);
     cout << "n_3  " << n_3 << endl;
     r3(r_1,n_1,r_2);
     cout << "r_3  " << r_3 << "\n";
     n4(r_2,r_3);
     cout << "n_4  " << n_4 << "\n";
     r4(r_2,n_4,r_3);
     cout << "r_4  " << r_4 << "\n";
     n5(r_3,r_4);
     cout << "n_5  " << n_5 << "\n";
     r5(r_3,n_5,r_4);
//  cout << "r_5  "  << r_5 << "\n";

     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;t[11]=n_4;t[12]=r_4;
     t[13]=n_5;t[14]=r_5;
          
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];p=&p_n_4;*p=t[11];
     p=&p_r_4;*p=t[12];p=&p_n_5;*p=t[13];p=&p_r_5;*p=t[14];
     
     h++;
    }
    cout << endl;
}

   int n1(int a, int b){
     n_1=a/b;
    return n_1;
}
   
   int r1(int b, int n_1){
       k=n_1*b;
       r_1=a-k;
       if(r_1==0){
       fn();
       calc(); 
      } 
       else;
       return r_1;
   }
   
int n2(int b, int r_1){
       n_2=b/r_1;
       return n_2;
}

int r2(int b, int n_2, int r_1){
       y=r_1*n_2;
       r_2=b-y;
       if(r_2==0){
           fn1();
          calc();
       }
       else;
       return r_2;
}

int n3(int r_1, int r_2 ){
    n_3=r_1/r_2;
    return n_3;
}

int r3( int r_1, int n_1,int r_2){
       r_3=r_1-(n_3*r_2);
       if(r_3==0){
           fn2();
           calc();
       }
       else;
       return r_3;
}

int n4(int r_2, int r_3){
    n_4=r_2/r_3;
    return n_4;
}

int r4(int r_2,int n_4,int r_3){
       r_4=r_2-(n_4*r_3);
       if(r_4==0){
           fn3();
           calc();
       }
       else;
       return r_4;
}

int n5(int r_3, int r_4){
    n_5=r_3/r_4;
    return n_5;
}

int r5(int r_3,int n_5, int r_4){
      r_5=r_3-(n_5*r_4);
      fn4();
      return r_5;
}

  void fn()
   {
     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;
       
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];p=&p_n_4;*p=t[11];
     p=&p_r_4;*p=t[12];p=&p_n_5;*p=t[13];p=&p_r_5;*p=t[14];
    
    cout << "fn  ";
    
    for(int i=0; i<10; i++){
       cout << t[i] << "  ";
    }
    
    cout << endl;
    print_to_r_1();
   }

   void fn1()
   {
     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;
   
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];
     
    cout << "fn1   ";
    
    for(int i=0; i<10; i++){
       cout <<  t[i] << "  ";
    }
    cout << endl;
    print_to_r_2();
   }

     void fn2()
   {
     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;
     
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];p=&p_n_4;*p=t[11];
     p=&p_r_4;*p=t[12];p=&p_n_5;*p=t[13];p=&p_r_5;*p=t[14];
     
    cout << "fn2   ";
    
    for(int i=0; i<10; i++){
      
       cout <<  t[i] << "  ";
    }
    cout << endl;
    print_to_r_3();
   }
   
     void fn3() {
      
     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;t[11]=n_4;t[12]=r_4;
     t[13]=n_5;t[14]=r_5;
     
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];p=&p_n_4;*p=t[11];
     p=&p_r_4;*p=t[12];p=&p_n_5;*p=t[13];p=&p_r_5;*p=t[14];
    
    cout << "fn3    ";
    
    for(int i=0; i<15; i++){
       cout <<  t[i] << "  ";
    }
    cout << endl;
    print_to_r_3();
   }

   void fn4() {  
     t[0]=a; t[1]=b; t[2]=k; t[3]=y; t[4]=o_1; t[5]=n_1; t[6]=r_1;              t[7]=n_2; t[8]=r_2; t[9]=n_3; t[10]=r_3;t[11]=n_4;t[12]=r_4;
     t[13]=n_5;t[14]=r_5;
     
     p=&p_a;*p=t[0];p=&p_b;*p=t[1];p=&p_k;*p=t[2];
     p=&p_y;*p=t[3];p=&p_o_1;*p=t[4];p=&p_n_1;*p=t[5];
     p=&p_r_1;*p=t[6];p=&p_n_2;*p=t[7];p=&p_r_2;*p=t[8];
     p=&p_n_3;*p=t[9];p=&p_r_3;*p=t[10];p=&p_n_4;*p=t[11];
     p=&p_r_4;*p=t[12];p=&p_n_5;*p=t[13];p=&p_r_5;*p=t[14];
     
     cout << "fn4    ";
    
     for(int i=0; i<15;  i++){
        cout <<  t[i] << "  ";
     }
     cout << endl;
     print_to_r_4();
 }

void print_to_r_1(){
         cout << endl;
         cout << setw(9) << p_a << setw(18) << p_r_1 << setw(14) << p_o_1  << "\n";
         cout << setw(9) << "-------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(9) << "--------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(8) << "-------" << "\n";
         cout << setw(9) << p_b << setw(18) << p_b << setw(17) << p_b << "\n";    
         cout << setw(44) << "-------"  << "\n";
         cout << setw(44) << p_r_1  << "\n\n";
         cout << setw(12) << "= " << setw(2) << "[ " << p_n_1 << "," << p_n_2 << "," << p_n_3 << "," << p_n_4 << "," << p_n_5 << "," << p_r_4 << " ]" << endl;
}

   void print_to_r_2(){
         cout << endl;
         cout << setw(9) << p_a << setw(18) << p_r_1 << setw(14) << p_o_1 << setw(19) << p_o_1 << setw(21) << p_o_1 << "\n";
         cout << setw(9) << "-------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(9) << "--------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(8) << "-------" << setw(2) << "="  << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << "\n";
         cout << setw(9) << p_b << setw(18) << p_b << setw(17) << p_b << setw(21) << p_r_2 << setw(21) << p_o_1 << "\n";    
         cout << setw(44) << "-------" << setw(11) << p_n_2 << setw(2) << "+" <<  setw(8) << "-------" << setw(11) << p_n_2 << setw(2) << "+" << setw(8) << "-------" << "\n";
         cout << setw(44) << p_r_1 << setw(21) << p_r_1 << setw(21)
<< p_n_1 << "\n";
         cout << setw(86) << "-----" << "\n";
         cout << setw(86) << p_r_2 << "\n\n";
         cout << setw(12) << "= " << setw(2) << "[ " << p_n_1 << "," << p_n_2 << "," << p_n_3 << "," << p_n_4 << "," << p_n_5 << "," << p_r_4 << " ]" << endl;
}

void print_to_r_3(){
         cout << endl;
         cout << setw(9) << p_a << setw(18) << p_r_1 << setw(14) << p_o_1 << setw(19) << p_o_1 << setw(21) << p_o_1 << "\n";
         cout << setw(9) << "-------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(9) << "--------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(8) << "-------" << setw(2) << "="  << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << "\n";
         cout << setw(9) << p_b << setw(18) << p_b << setw(17) << p_b << setw(21) << p_r_2 << setw(21) << p_o_1 << "\n";    
         cout << setw(44) << "-------" << setw(11) << p_n_2 << setw(2) << "+" <<  setw(8) << "-------" << setw(11) << p_n_2 << setw(2) << "+" << setw(8) << "-------" << "\n";
         cout << setw(44) << p_r_1 << setw(21) << p_r_1 << setw(21)  <<  p_r_1 << "\n";
         cout << setw(86) << "-----" << "\n";
         cout << setw(86) << p_r_2 << "\n\n";
          
//----------------------------------------------
      
          cout << setw(25) << p_o_1 << setw(21) << p_o_1 << setw(22) << p_o_1 <<  "\n";

       cout << setw(11) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(15) << "--------------" << "\n";

       cout << setw(27) << p_o_1 << setw(21) << p_o_1 << setw(22) << p_o_1 <<  "\n";

       cout << setw(20) << p_n_2 << setw(2) << "+" << setw(8) << "-------" << setw(11)  << p_n_2 << setw(2) << "+" << setw(8) << "-------" << setw(11) << p_n_2 << setw(2) << "+" << setw(11) << "----------" << "\n";

       cout << setw(30) << p_r_3 << setw(20)  << p_o_1 << setw(22) << p_o_1 <<  "\n";

       cout << setw(24) << p_n_3 << setw(2) << "+" << setw(4) << "---" << setw(15) << p_n_3  << setw(2) << "+" << setw(4) << "---" << setw(15) << p_n_3  << setw(2) << "+" << setw(7) << "------" << "\n";
   
       cout << setw(30) << p_r_2 << setw(21) << p_r_2 << setw(24) <<p_r_4 <<  "\n";
   
       cout << setw(51) << "---" << setw(19) << o_1 << setw(2) << "+" << setw(3) << "--" << "\n";
   
       cout << setw(51) << p_r_3 << setw(24) << p_r_3  << "\n\n";
       
       cout << setw(12) << "= " << setw(2) << "[ " << p_n_1 << "," << p_n_2 << "," << p_n_3 << "," << p_n_4 << "," << p_n_5 << "," << p_r_4 << " ]" << endl;
}

void print_to_r_4(){
         cout << endl;
         cout << setw(9) << p_a << setw(18) << p_r_1 << setw(14) << p_o_1 << setw(19) << p_o_1 << setw(21) << p_o_1 << "\n";
         cout << setw(9) << "-------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(9) << "--------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(8) << "-------" << setw(2) << "="  << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << "\n";
         cout << setw(9) << p_b << setw(18) << p_b << setw(17) << p_b << setw(21) << p_r_2 << setw(21) << p_o_1 << "\n";    
         cout << setw(44) << "-------" << setw(11) << p_n_2 << setw(2) << "+" <<  setw(8) << "-------" << setw(11) << p_n_2 << setw(2) << "+" << setw(8) << "-------" << "\n";
         cout << setw(44) << p_r_1 << setw(21) << p_r_1 << setw(21)
<< p_n_1 << "\n";
         cout << setw(86) << "-----" << "\n";
         cout << setw(86) << p_r_2 << "\n\n";
 
//----------------------------------------------
        cout << setw(25) << p_o_1 << setw(21) << p_o_1 << setw(22) << p_o_1 <<  "\n";

        cout << setw(11) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(12) << "-----------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(15) << "--------------" << "\n";

       cout << setw(27) << p_o_1 << setw(21) << p_o_1 << setw(22) << p_o_1 <<  "\n";


       cout << setw(20) << p_n_2 << setw(2) << "+" << setw(8) << "-------" << setw(11)  << p_n_2 << setw(2) << "+" << setw(8) << "-------" << setw(11) << p_n_2 << setw(2) << "+" << setw(11) << "----------" << "\n";

    cout << setw(30) << p_r_3 << setw(20)  << p_o_1 << setw(22) << p_o_1 <<  "\n";

    cout << setw(24) << p_n_3 << setw(2) << "+" << setw(4) << "---" << setw(15) << p_n_3  << setw(2) << "+" << setw(4) << "---" << setw(15) << p_n_3  << setw(2) << "+" << setw(7) << "------" << "\n";

     cout << setw(30) << p_r_2 << setw(21) << p_r_2 << setw(24) <<p_r_4 <<  "\n";

     cout << setw(51) << "---" << setw(19) << o_1 << setw(2) << "+" << setw(3) << "--" << "\n";
 
     cout << setw(51) << p_r_3 << setw(24) << p_r_3  << "\n\n";
     
//------------------------------------------------

    cout << setw(28) << p_o_1 << setw(25) << p_o_1 << "\n";

    cout << setw(11) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(17)  << "---------------" << setw(2) << "=" << setw(5) << p_n_1 << setw(2) << "+" << setw(17) << "----------------" <<  "\n";

    cout << setw(30) << p_o_1 << setw(25) << p_o_1 << "\n";
   
    cout << setw(21) << p_n_2 << setw(2) << "+" << setw(12) << "-----------" << setw(11) << p_n_2 << setw(2) << "+" << setw(13) << "------------" << "\n";
   
    cout << setw(32) << p_o_1 <<  setw(25) << p_o_1 << "\n";
   
    cout << setw(25) << p_n_3 << setw(2) << "+" << setw(8) << "-------" << setw(15) << p_n_3 << setw(2) << "+" << setw(9) << "--------" << "\n";
   
    cout << setw(34) << p_o_1 << setw(25) << p_o_1 << "\n";
   
    cout << setw(29) << p_n_4 << setw(2) << "+" << setw(4) << "---" << setw(19) << p_n_4  << setw(2) << "+" << setw(5) << "----" << "\n";
   
    cout << setw(35) << p_r_3 << setw(26) << p_r_5  << "\n";
   
    cout << setw(35) << "---" << setw(21) <<p_n_5  << setw(2) << "+"
<< setw(3) << "--" << "\n";

    cout << setw(35) << p_r_4 << setw(26) <<  p_r_4 << "\n\n";
   
   cout << setw(12) << "= " << setw(2) << "[ " << p_n_1 << "," << p_n_2 << "," << p_n_3 << "," << p_n_4 << "," << p_n_5 << "," << p_r_4 << " ]" << endl;
}

cc1plus: warnings being treated as errors
In function 'int calc()':
Line 85: warning: control reaches end of non-void function