How to generate a random int in C?

Question

Is there a function to generate a random int number in C? Or will I have to use a third party library?

Answer 1

This is a good way to get a random number between two numbers of your choice.

#include 
#include 
#include 

    #define randnum(min, max) \
        ((rand() % (int)(((max) + 1) - (min))) + (min))

int main()
{
    srand(time(NULL));

    printf("%d\n", randnum(1, 70));
}

Output the first time: 39

Output the second time: 61

Output the third time: 65

You can change the values after randnum to whatever numbers you choose, and it will generate a random number for you between those two numbers.