How to use rand() to generate numbers in a range? [duplicate]

Question

Possible Duplicate:
Generate Random numbers uniformly over entire range
How to use rand function to

Could anyone tell me how to use the rand() function in C programming with 1 = min and
7 = max, 1 and 7 included.

Thanks

Answer 1

This will do what you want:

rand() % 7 + 1

Explanation:

• rand() returns a random number between 0 and a large number.

• % 7 gets the remainder after dividing by 7, which will be an integer from 0 to 6 inclusive.

• + 1 changes the range to 1 to 7 inclusive.

Answer 2

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.