C program to print Hex values of characters in string

Following program prints the hexadecimal values of all the characters in any string. Currently we have used a static string for the demonstration, but you can write your own function to print hex values by passing string as input argument to the function for the debugging purpose and call that function as and when necessary.

$ vim char_to_hex.c

#include <stdio.h>
#include <string.h>
 
int main(int argc, char **argv) {
        unsigned char any_string[] = "helloworld";
        int i;
 
        for (i=0; i < strlen(any_string); i++ )
                printf("%2x ",any_string[i] & 0xff);
 
        printf("\n");
        return 0;
}

Compile this program as,

$  gcc -o char_to_hex char_to_hex.c

Execute the binary as,

$ ./char_to_hex
68 65 6c 6c 6f 77 6f 72 6c 64

As you can see above, we can see the Hex equivalent for the characters “Helloworld” is print by the program.