// multiplication 
#include < iostream.h>
int main()
{
 int j  ;
int i  ;
int multi ;

for ( j=1; j<13 ;j++);
{
  for (i=1;i<13;i++ );
{
      multi = j*i ;
cout << multi :
}
}
return 0;
}

There are a few things that you need to do.

The main ones are formatting and basic syntax. I would suggest going over the tutorial at http://www.cplusplus.com/doc/tutorial/.

// multiplication
#include <iostream> //use iostream (iostream.h should not be used any more)
using namespace std; //can use this or add std:: infront of cout and endl or you can use using std::cout; and using std::endl;

int main()
{
	int j, i, multi;

	for( j = 1; j < 13; j++ ) //get rid of semi-colon
	{
		for( i = 1; i < 13; i++ ) //get rid of semi-colon
		{
			multi = j*i;
			cout << multi << endl; //change colon to semi-colon (added << endl to make output readable)
		}
	}
	return 0;
}
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