How do I make this faster?

#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;
}

In HolyC you could store that entire string within a cpu register avoiding costly memory instructions.

Performance increase of ~60x.

In C you could avoid memory access thusly: -

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

int main() {
register unsigned int next = time(NULL);

for(register int c = 0; c < 5; c++) {
next = next * 1103515245;
next = next + 12345;
next = next / 65536;
next = next % 94;
next = next + 33;
putchar(next);
putchar('\t');
}
return 0;
}