int main(int argc, char* argv[]) {
char c = 't';
if (c >= 48 && c <= 57) {
printf("This is a digit: %c\n", c);
} else {
printf("This is not a digit: %c\n", c);
}
if (c >= '0' && c <= '9') {
printf("This is a digit: %c\n", c);
} else {
printf("This is not a digit: %c\n", c);
}
return 0;
}