How to check if the entered character is a digit? - c

Question

Given task is:
Enter 10 characters. For each character entered the corresponding function prints whether it is a digit 0-9 or not.(Also I use older compiler if anyone concerns about my "gets()" and goal is to do this without pointers.)
So far I tried something like this, but for some reason it does not work:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void){
char character[10][1];
char zero ='0';
char nine ='9';
int i;
printf("Enter 10 characters:\n");
for(i=0;i<10;i++){
gets(character[i]);
}
for(i=0;i<10;i++){
if(strcmp(character[i],zero)>=0 && strcmp(character[i],nine)<=0){
printf("%d. character '%c' is a digit.", i, character[i]);
}
else{
printf("%d. character '%c' is not a digit.", i, character[i]);
}
putchar('\n');
}
return 0;
}
Also I tried this, but it can not output correctly characters:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void){
char character[10][1], pom[10][1];
int num_character[10];
int i;
printf("Enter 10 characters:\n");
for(i=0;i<10;i++){
gets(character[i]);
strcpy(pom[i],character[i]);
num_character[i]=atoi(character[i]);
}
for(i=0;i<10;i++){
if(num_character[i]!=0){
printf("Character '%c' is digit.", pom[i]);
}
else{
printf("Character '%c' is not digit.", pom[i]);
}
putchar('\n');
}
return 0;
}
isdigit() also does not work after I include ctype header.

Answer 1

You are doing several things wrong here, gets is never recommended and fgets will put new line character in the end.
The syntax for strcmp is:
int strcmp(const char *s1, const char *s2);
You need two strings as input in strcmp but you are using a string and a character.
Here, it is better to use a character array than a 2D array.
#include <stdio.h>
int main(void)
{
char character[10]; //a simple character array
char zero ='0';
char nine ='9';
int i;
printf("Enter 10 characters:\n");
for(i=0;i<10;i++){
scanf(" %c", &character[i]); //scan characters
}
for(i=0;i<10;i++)
{
if(character[i] >= zero && character[i] <= nine) //print
printf("%d. %c is a digit \n", i+1, character[i]);
else
printf("%d. %c is not a digit \n", i+1, character[i]);
}
}