【模板小程序】获得一段区间内的随机数

 1 //要取得[a,b)的随机整数，使用(rand() % (b-a))+ a; 左闭右开
 2 int RandomInRange_leftClose_rightOpen(int a, int b)
 3 {
 4     srand((unsigned int)time(NULL));
 5     return (rand() % (b-a))+ a;
 6 }
 7 //要取得[a,b]的随机整数，使用(rand() % (b-a+1))+ a;
 8 int RandomInRange_leftClose_rightClose(int a, int b)
 9 {
10     srand((unsigned int)time(NULL));
11     return (rand() % (b-a+1))+ a;
12 }
13 //要取得(a,b]的随机整数，使用(rand() % (b-a))+ a + 1;
14 int RandomInRange_leftOpen_rightClose(int a, int b)
15 {
16     srand((unsigned int)time(NULL));
17     return (rand() % (b-a))+ a + 1;
18 }