Program in c presenting output, strange different from the value of variables

This error occurs because, you that use a string (text) and used only a char(character). In the C language a string is represented by a NULL-terminated character vector '\0'. But you put only as Char nick . The correct would be for example Char nick[100];

When declaring char the compiler will allocate only 1byte of memory capable of storing a character.

However after putting this char[100] you you will get another error, check:

That is, it is not possible to assign a string field of a struct to a string constant "Assanges". To work you must use the (string copy) function or strcpy (destination, source). So put: strcpy (user.nick, "Assanges"); and it will work!

Remember to do include of string.h

Check out:

See below for the code correct

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

struct User{
 char nick[100];
 int id;
}user;
int main(){
   strcpy(user.nick, "Assanges");
   user.id = 45474;
   printf("\nNick:%s\nId:%d \n", user.nick, user.id);

return 0;
}

Now running will work!