#include <iostream>
#include <cstdlib>
#include <ctime>

int main()
{
    std::srand( std::time(nullptr) ) ;

    for( int i = 0 ; i < 5 ; ++i ) // 5 lines
    {
        for( int j = 0 ; j < 7 ; ++j ) // write 7 random digits per line
            std::cout << std::rand() % 10 << ' ' ;

        std::cout << '\n' ; // and end with a new line
    }
}