mixing tables

Not sure what your question is but here goes..

if you have several tables and you want to output them in a mixed fashion I assume it isn't random.

Let's say you have two tables and you want to output the tables like this:

A[0], B[0], A[1], B[1], B[0]+B[1], A[2], B[2], B[1] + B[2], B[0] + B[1] + B[2], etc...

if A and B are two tables then you can produce that output by:

for (int i = 0; i < A_elems; ++i) {
   cout << A[i] << " ";
   int sum = 0;
   for (int j = i; j >= 0; --j) {
      sum += B[j];
      cout << sum << " ";
   }
   cout << endl;
}

A0 B0
A1 B1 B0+B1
A2 B2 B1+B2 B0+B1+B2
A3 B3 B2+B3 B1+B2+B3 B0+B1+B2+B3
etc...

If you tell us how you plan to merge the tables, we can tell you how to do it :-)

Alf

Am i realy that bad in telling what i want to know?.

When a teacher wants to learn his students the tables
she learns them in order like: 1 * 2 = 2, 2 * 2 = 4,
3 * 2 = 6 etc.

Now when the students have learned the table of 2 in this case, they get a test, the test will not come out like this: 1 * 2 = ?, 2 * 2 = ?, 3 * 2 = 6.
No, it will come out in different ways like 3 * 2 = ?,
1 * 2 = ?, 2 * 2 = ?.

Thats what i wat in my program i want my program to test if the students know the table of 2, by letting my program output the tables in different ways.

Can you use my tables
tables0[10]= "1 * 2 = ";
tables1[10]= "2 * 2 = ";
tables2[10]= "3 * 2 = ";
tables3[10]= "4 * 2 = ";
tables4[10]= "5 * 2 = ";

Can you show me a working program hope its not to much to ask.

>>When a teacher wants to learn his students the tables
did you mean "When teacher wans to teach..."

try something like this:

int num;
srand((unsigned) time(NULL)); //seed random generator
num = rand();
num = num%5; //5 I assume number of tables
switch(num){
case 1://output tables1;
case 2://output tables2;
//and so on
}

Can you please show me a full working program that shows
these: tables0[10]= "1 * 2 = ";
tables1[10]= "2 * 2 = ";
tables2[10]= "3 * 2 = ";
tables3[10]= "4 * 2 = ";
tables4[10]= "5 * 2 = ";

but then in your formule.
thx already.

Its not homework, just want to see some code's so that i can learn from them.

Can you tell me what the function's rand(), srand()  does, i dont have an honost buyed compiler, they are to expensive so i dont have the documentation of the runtime library, maybe you know where i can download it for the compiler (visual c++ 6.0 its part of my microsoft visual studio).

Can you also explain what this does: num % 5.

I hope i'm not to much trouble.
Thanks already.

#include <iostream.h>
#include <stdlib.h>
#include <time.h>
void main(void)
{
     int nummer0, nummer1, nummer2, nummer3,
        nummer4, teller=0;
   
     int num, i;
    char tables0[10]= "1 * 2 = ";
    char tables1[10]= "2 * 2 = ";
    char tables2[10]= "3 * 2 = ";
    char tables3[10]= "4 * 2 = ";
    char tables4[10]= "5 * 2 = ";

    srand((unsigned) time(NULL)); //seed random generator
   
    for(i=0; i<5; i++){
         num = rand();
         num = num%5; //5 I assume number of tables
         switch(num){
              case 0:cout << tables0;
                      cin >> nummer0;
                      if(nummer0==2)
                      cout << "Goed" << endl;
                      else
                      {
                           cout << "Fout" << endl;
                           teller++;
                      }
                  break;
             
                 case 1:cout << tables1;
                      cin >> nummer1;
                     if(nummer1==4)
                           cout << "Goed" << endl;
                      else
                      {
                           cout << "Fout" << endl;
                           teller++;
                      }

                      break;

              case 2:cout << tables2;
                      cin >> nummer2;
                      if(nummer2==6)
                           cout << "Goed" << endl;
                      else
                      {
                           cout << "Fout" << endl;
                           teller++;
                       }
                      break;
             
                 case 3:cout << tables3;
                      cin >> nummer3;
                      if(nummer3==8)
                           cout << "Goed" << endl;
                      else
                      {
                           cout << "Fout" << endl;
                           teller++;
                         
                      }
               break;
                 case 4:cout << tables4;
                      cin >> nummer4;
                      if(nummer4==10)
                           cout << "Goed" << endl;
                      else
                      {
                           cout << "Fout" << endl;
                          teller++;
                           
                      }
                     break;
           }
                     
    }
   
     cout << "Aantal fouten antwoorden: " << teller << endl;
     cout << "Aantal goede antwoorden: " << 5 - teller << endl;
}

Looks nice so far he!.
I only think it repeats to often the same tables, can you please help me with that, i beak of you.

about documentation ... I know there is an MSDN library online, but I don't know the link to it, so you can try to search in google.com or microsoft.com
it is really good help system

rand() generates random number from 0 to RAND_MAX
so rand()%5 will produce the number from 0 to 4
% - modulo, the remainder of division, for example
4%2 = 0
5%3 = 2
so whatever % 5 will be some number between 0 and 4

srand is to seed the random generator, think about it this way, if you don't put it, everytime you re-run the program it will be giving same random numbers
try to remove that line and run program 2-3 times, see what will happen


I think I answered everything, if other questions, ask

Thanks for your great help!.