A simple random number generator based on rand() and srand() functions.
srand() function is used to initialize seed for random number.
Example - srand()
#include<stdlib.h>
// Create random number between 0 and 100.
int n = rand() % 100;
// Create random character between '0' and '9' in ASCII code.
srand(time(NULL));
for(i=0;i<100;i++)
{
char ch = rand() % (57-48+1)+48;
putc(ch);
}