setting a random number in c code example

Example 1: how to create random integers from a specific range in c language

//How to create random integers within a specific range in C langauge. 

srand(time(0))
number = (rand() % (upper - lower + 1)) + lower
//upper = max number
//lower = least number

Example 2: how to genrate a random number in C

#include <time.h>
#include <stdlib.h>

srand(time(NULL));   // Initialization, should only be called once.
int r = rand();      // Returns a pseudo-random integer between 0 and RAND_MAX.