If you are going to hard code the values, here is a unique approach.
CODE
#include <stdio.h>
#include <ctype.h>
#define MAX 128
int main(int argc, char *argv[]) {
char romans[13][MAX];
int arg_1;
if(argc < 2) {
printf("You must provide at least one argument\n");
exit(0);
}
arg_1=atoi(argv[1]);
if(arg_1>12) {
printf("We can only go as high as 12\n");
exit(0);
}
sprintf(romans[0],"Roman Strings");
sprintf(romans[1],"I");
sprintf(romans[2],"II");
sprintf(romans[3],"III");
sprintf(romans[4],"IV");
sprintf(romans[5],"V");
sprintf(romans[6],"VI");
sprintf(romans[7],"VII");
sprintf(romans[8],"VIII");
sprintf(romans[9],"IX");
sprintf(romans[10],"X");
sprintf(romans[11],"XI");
sprintf(romans[12],"XII");
printf("%i equals %s\n",arg_1,romans[arg_1]);
return 0;
}