rand char

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

#include <tchar.h>

int _tmain(int argc, _TCHAR* argv[])
{
	int i=20;
	char s[20];

	srand((unsigned int)time(NULL));

	char a='A';
	for (i =1; i <= 20; i++) {
	   s[i]=rand() % 22 +(int)(a);
	   s[i]=(char)s[i];
	   printf("%c\n", s[i]);
	}
	system("pause");
	return 0;
}