How to pass struct variable to function as argument or reference in C?

Question

I want to pass a struct variable as a function parameter (sorry for bad English.) Here is what I want to do:

#include <stdio.h>
#include <stdint.h>

typedef struct {
  int temp;
  int hum;
  int oxy;
} Data;

Data sens1;
Data sens2;
Data sens3;

sens1.temp = 5;
sens2.temp = 10;
sens3.temp = 15;


int ort(Data temp1 , Data temp2 , Data temp3)
{
  int ort = ((temp1 + temp2 + temp3) / 3);
  return ort;
}

int main(void)
{
  printf("%d", ort(sens1.temp, sens2.temp, sens3.temp));
  return 0;
}

How to add struct member called temp to function ort() as parameter?

You're adding Data structures in temp1 + temp2 + temp3, that doesn't make sense (and won't compile). Please explain what the ort function is supposed to do. — Jabberwocky
– Jabberwocky, Commented Aug 6, 2022 at 9:30
i create struct which names Data, then i create 3 objects , Data sens1 , Data sens2 and Data sens3. The ort function has to sum sens1.temp + sens2.temp + sens3.temp and divide them to 3 and return the value — turqay mammadov
– turqay mammadov, Commented Aug 6, 2022 at 10:38

Jabberwocky · Accepted Answer · 2022-08-06 09:34:42Z

2

You cannot add structs, and that's what you are doing in temp1 + temp2 + temp3.

You probbaly want this:

int ort(Data sensor1 , Data sensor2, Data sensor2)
{
  int ort = ((sensor1.temp + sensor2.temp + sensor2.temp) / 3);
  return ort;
}
...
printf("%d" , ort(sens1, sens2, sens3);
...

or this:

int ort(int temp1, int temp2, int temp3)
{
  int ort = ((temp1 + temp2 + temp3) / 3);
  return ort;
}
...
printf("%d" , ort(sens1.temp, sens2.temp, sens3.temp);
...

answered Aug 6, 2022 at 9:34

Jabberwocky

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2 Comments

turqay mammadov Over a year ago

thanx for your answer, and could you please tell what can be done for reduce the memory used by this function?

Jabberwocky Over a year ago

This piec of code does not use mich memory. There is not much you can do. Why do you think you need "reduce memory" here?

William Pursell · Accepted Answer · 2022-08-06 13:40:00Z

1

If you want to pass a reference to the struct rather than the whole struct, the typical method is something like:

#include <stdio.h>
#include <stdint.h>

struct data {
        int temp;
        int hum;
        int oxy;
};

struct data sens1 = { .temp = 5 };
struct data sens2 = { .temp = 10 };
struct data sens3 = { .temp = 15 };


float
ort(const struct data *d1, const struct data *d2, const struct data *d3)
{
        return (float)(d1->temp + d2->temp + d3->temp) / 3;
}

int
main(void)
{
        printf("%f\n", ort(&sens1, &sens2, &sens3));
        return 0;
}

answered Aug 6, 2022 at 13:40

William Pursell

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