Wednesday, March 15, 2017

C++ Part 27

Rand Function

The C++ library with header file <cstdlib> contains a random number function
named
rand. Rand function is making a Random number; however, the output is not completely random and mix the output with time function to receive a complete random number.


For example to make a random number between 0 to 10 (less than 10 ) you can use this method:
int i;
for (i = 0; i < 10; i++)
cout << rand( ) << endl;  


A sequence of pseudorandom numbers is usually determined by one number known
as the seed.
Example 2 :

For this example I seed the srand with a number 99 . It can be any number , but usually mixing srand function with a current time will help to find a better random number.
int i;
srand(99);
for (i = 0; i < 10; i++)
cout << (rand( ) % 11) << endl;
srand(99);
for (i = 0; i < 10; i++)
cout << (rand( ) % 11) << endl;  

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