C++:c++ generates random numbers outside a particular area of the picture __c++

Reference text: C + + produces random number (integer)

C + + in a specific area of the picture generated random numbers, avoid regular expressions, can be divided into two situations.

First: Generate random numbers before a certain number; the second, generate random numbers, plus a certain number, and then truncate; the third is to generate random numbers within the specified range;

1. Generate random numbers before a certain number

int thres; Generates a random number between [0, dis), noting that dis
printf ("%d\n", Random (Thres)) is not included;

2. Generate random numbers between two numbers

int Random (int m, int n)
{
		int pos, dis;
		if (M = = N) {return
			m;
		}
		else if (M > N) {
			pos = n;
			dis = m-n + 1;
			Return rand ()% dis + pos;
		}
		else
		{
			pos = m;
			dis = n-m + 1;
			Return rand ()% dis + pos;
		}

Test code:

int Testrand (int argc, _tchar* argv[])
{
		srand ((int) time (NULL));//For Random random seed
		int m = 7;
		int n =;
		for (int i = 0; i < ++i)
		{
			float f = Random (M, n);
			Std::cout << f << std::endl;
		}
		return 1;
}

Generate floating-point number random numbers