how to print unsigned char in c

/*
Example:how to represent unsigned char in C printf function
*/

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

int main(int argc, char const *argv[]) {

    signed char char1=255;
    unsigned char char2=255;
    printf("Signed char : %d\n",char1);
    printf("Unsigned char : %d\n",char2);
	return 0;
}