Possible Duplicate:
Generate Random numbers uniformly over entire range
How to use rand function to可能的重复:在整个范围内均匀地生成随机数如何使用rand函数
Could anyone tell me how to use the rand() function in C programming with 1 = min and
7 = max, 1 and 7 included.
谁能告诉我如何在C编程中使用rand()函数，其中包括1 = min和7 = max, 1和7。
Thanks
谢谢
2 个解决方案
#1
15
This will do what you want:
这将做你想做的:
rand() % 7 + 1
Explanation:
解释:
-
rand()returns a random number between0and a large number.rand()返回一个0到一个大数字之间的随机数。
-
% 7gets the remainder after dividing by7, which will be an integer from0to6inclusive.% 7在除以7后得到余数，这是一个从0到6的整数。
-
+ 1changes the range to1to7inclusive.+ 1将范围更改为1到7(含)。
#2
3
Use the modulo operator. It returns the remainder when dividing. Generate a number in range 0 to 6 by using rand() % 7. Add 1 to that to generate a number in range 1 to 7.
使用的模运算符。它在除法时返回余数。使用rand() % 7生成范围为0到6的数字。再加1，生成范围为1到7的数字。
#1
15
This will do what you want:
这将做你想做的:
rand() % 7 + 1
Explanation:
解释:
-
rand()returns a random number between0and a large number.rand()返回一个0到一个大数字之间的随机数。
-
% 7gets the remainder after dividing by7, which will be an integer from0to6inclusive.% 7在除以7后得到余数，这是一个从0到6的整数。
-
+ 1changes the range to1to7inclusive.+ 1将范围更改为1到7(含)。
#2
3
Use the modulo operator. It returns the remainder when dividing. Generate a number in range 0 to 6 by using rand() % 7. Add 1 to that to generate a number in range 1 to 7.
使用的模运算符。它在除法时返回余数。使用rand() % 7生成范围为0到6的数字。再加1，生成范围为1到7的数字。