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11. Pseudo-random numbers 

  • 
#include <iostream>
#include <cstdlib> // for rand() and srand()
#include <ctime>

int main()
{
    srand( (unsigned)time( 0 ) );
    for(;;) {
        std::cout << rand() % 10;
        std::cout << '\t';
    }
    return 0;
}

  • time function returns the number of seconds elapsed since midnight, January 1, 1970.

  • srand will seed new sequence of pseudo-random numbers, so that the numbers will be different every time we run.
    (The initial seed is 1.)

  • rand returns an integer pseudo-random number.

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