警告：格式'％c'需要类型'int'，但参数2的类型为'char *'

Question

I'm trying to print all characters stored in hex array to the screen, one by one, but I get this strange error in line 16. As far as I know, %c should be expecting a char, not an int. Why I'm getting this error? Below is my code, thanks.

    #include <stdio.h>
    #include <stdlib.h>
    #include <limits.h>
    #include <ctype.h>
    #include <string.h>

    int main() 
    {
        char hex[8] = "cf0a441f";
        int hexCounter;
        char *currentHex;

        for(hexCounter=0; hexCounter<strlen(hex); hexCounter++)
        {
            currentHex = &hex[hexCounter];
            printf("%c",currentHex);
        }   
         return 0;
    }

Answer 1

You mean

printf("%c", *currentHex);

In my opinion you can remove the entire idea of currentHex since it just adds complexity for no value. Simply do:

printf("%c", hex[hexCounter]);

The important point is that you're supposed to pass the value of the character itself, not it's address which is what you're doing.

Answer 2

You have hex[hexCounter] as a char so when you set

currentHex = &hex[hexCounter];

you are setting currentHex to the address of a char , ie a char * . As such, in your printf you need

printf("%c",*currentHex);

What you are doing is unnecessary anyway, since you could just do

printf("%c",hex[hexCounter]);

Answer 3

currentHex should be of type char , not char * .

 char currentHex;

 [..]

 currentHex = hex[hexCounter];
 printf("%c",currentHex);

If you really want it to be a pointer, dereference it to print:

printf("%c",*currentHex);

Answer 4

Here's the modified code which runs fine for me -

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

#include <limits.h>
#include <ctype.h>
#include <string.h>

int main() 
{
    char hex[9] = "cf0a441f";
    unsigned int hexCounter; 
    char *currentHex;
    for(hexCounter=0; hexCounter<strlen(hex); hexCounter++)
    {
        currentHex = &hex[hexCounter];
        printf("%c",*currentHex);
    }   
     return 0;
}