Program

#include<stdio.h>

int main()
{
	//counter, it can also be declared as 'char'
	int count;
	//initializing counter by 'a'
	count= '0';
	//definig label
	start:
	printf("%c [%d] ",count,count);
	count++;
	//jumping back to 'stat' if condition is true
	if(count <= '9')
		goto start;
	return 0;
}

Output

0 [48] 1 [49] 2 [50] 3 [51] 4 [52] 5 [53] 6 [54] 7 [55] 8 [56] 9 [57] 

This is a way, by which we can print ASCII values of all digits, please write through comment, if you have any doubt?