/prog/ - How do I make this faster?

Name: Anonymous 2019-09-10 17:01

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

int myrand(int min, int max) {
    int new_value;
    static int previous_value;

    if(min > max) return 1;

    do {
        srand(time(NULL));
        new_value = rand() % (max - min);
    } while(new_value == previous_value);

    previous_value = new_value;
    return new_value;
}

int main() {
    for(register char c = 0; c < 5; c++) {
        printf("%c\t", myrand(33, 126));
    }

    putchar('\n');
    return 0;
}

Name: Anonymous 2019-09-11 22:26

with Ada.Numerics.Discrete_Random;
with Ada.Text_IO; use Ada.Text_IO;
procedure Random is
	subtype Printable_Character is Character range Character'Val(33) .. Character'Val(126);
	package Random_Printable_Character is new Ada.Numerics.Discrete_Random(Printable_Character);
	use Random_Printable_Character;
	G : Generator;
	Current, Previous : Character := Character'Val(0);
	function Unique return Character is
	begin
		loop
			Current := Random(G);
			exit when Current /= Previous;
		end loop;
		Previous := Current;
		return Current;
	end Unique;
begin
	Reset(G);
	for I in 1..5 loop
		Put(Unique);
	end loop;
	New_Line;
end Random;

How do I make this faster?

1 Name: Anonymous 2019-09-10 17:01

14 Name: Anonymous 2019-09-11 22:26

Name: Anonymous 2019-09-10 17:01

Name: Anonymous 2019-09-11 22:26