How we can write hexadecimal value in a string?

Question

Can we realloc a string inside a structure?

struct info
{
     char name[20];
     int age;
     char address[20];
}; 

struct info d[10];

I want to realloc name, how can I do it?

Answer 1

Use %x inside printf but still I am thinking that my answer is doubtful as you are saying it to write in a string form.
You can build a char array by using this method or try to 0x before %x in printf.
Simple example based on a character:

#include <stdio.h>

int main(void) {
    // your code goes here

    printf("0x%x", 15);
    return 0;
}

output: 0xf
Online link: https://ideone.com/opLXV8

Answer 2

#include<stdio.h>
#include<string.h>
main()
{
        int a;
// Printing address of a which is hexadecimal value
        printf("Address of A = %p\n",&a);
        char str[100];
// Storing address of a inside character array(string)
        sprintf(str,"%p",&a);
// Printing string
        printf("STR = %s\n",str);
}