Home » accessing values structure within structure? [closed]

accessing values structure within structure? [closed]

Solutons:


Just create an object of emp1 inside your main, and give it a value like below and it should be ok

emp1 emp;
emp.number.number1=3;
//printf then with emp.number.number1 ;)

You are accessing the value “number1” like

emp1.number.number1

but here “emp” data type defined by you. So to access “number1” from other struct, first ou have to create object of the second struct. Like

emp1 obj;

and then access “number1” from second struct like

obj.number.number1

In the code you’ve provided, not a single variable is being declared. There are only two structure definitions there (num and Employee), and then two type definitions associated with them (d1 and emp1).

If you were to attempt compiling a code as the following:

#include <stdio.h>
#include <inttypes.h>

typedef struct num {
    uint32_t number1;
    uint32_t number2;
} d1;

typedef struct Employee {
    char ename[20];
    int ssn;
    float salary;
    d1 number;
} emp1;

int main( ) {
    printf( "value of number1: %" PRIu32 "n", emp1.number.number1 );
    return 0;
}

You’d receive an error, indicating that there is no variable such as emp1 available.

First, I’ll try to briefly explain what typedef does: It defines new a new type, or several new types; for an already defined type you desire. The syntax is as follows:

typedef definedtype newtype1[, newtype2, ... ];

One particular use of it is that it allows you to create a new variable with that newtype1 you’ve defined, like for example:

emp1    empvariable1;
// equivalent to struct Employee empvariable1;

So, if you were hoping to have a variable of your structure and call it emp1, you should change the name of the new type you’ve defined; then also declare a variable of that type with the name emp1, also preferably initialize it as well:

#include <stdio.h>
#include <inttypes.h>

typedef struct num {
    uint32_t number1;
    uint32_t number2;
} d1;

typedef struct Employee {
    char ename[20];
    int ssn;
    float salary;
    d1 number;
} emp;  // removed "1"

int main( ) {
    emp emp1 = {
        "ThoAppelsin",
        1337,
        123456789.0,
        {
            100,
            200
        }
    };

    printf( "value of number1: %" PRIu32 "n", emp1.number.number1 );
    return 0;
}

Now it prints 100, hopefully as you’d expect it to, as I do.

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