how to return 2 values upon calling a function

Hi everyone. How would i return two values each time I call a function? I have this program here, that is extracting 2 values from a text file every time a function is called, but I only seem to be able to return one value each time the function is called. I need to return column1 and column2 each time readingFunction() is called and they should be stored in readingsArray[loop] and temperatureArray[loop]. is it possible to return two values upon calling a function?

Code:

---


#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>


float readingFunction(int loop);


int main(void)
{                               
        int menu = 0;                                                                                                                 
        int readingsArray[10];
        float temperatureArray[10];
        int loop=0;


        do
        {
                printf("\n\n The sensor readings and their corresponding temperatures:\n\n");


                for(loop=0; loop < 10; ++loop) // Gives the user a set of readings
                {
                        temperatureArray[loop] = readingFunction(loop);
                        printf("\nreading number %i is %i which is %f degree's", loop, temperatureArray[loop]);
                }


               
        return 0;




float readingFunction(void)
{
        FILE *fp;       
        int signalOutput;
        int flag=0;
        int column1;
        float column2;
        srand(time(NULL));       


        fp = fopen("LOOKUP.txt", "r");
        signalOutput = (int)(rand()%15);
        flag=0;
                       


        while( ! flag ){
                fscanf(fp, "%i %f",&column1, &column2);
                               
                if ( signalOutput <= column1 )
                        {
                                        flag = 1;
                                        fclose(fp);                       
                        }       
                }


        return column1;
}

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in C you can only return a single value from a function as the return value. however the return value can be a struct. so one way to do it would be to declare a struct with the 2 elements you need and return the entire struct.

Code:

---

struct X {
    float a;
    float b;
};

struct X function(void) {
  struct X r;
  r.a = 0.0f;
  r.b = 1.0f;
  return r;
}

...
struct X x;
x = function();
printf("%f %f\n",x.a,x.b);

---

the other way is to pass in pointers to the return values you want as arguments and set the values thru the pointers

Code:

---

void function(float *a,float *b)
{
    *a = 0.0;
    *b = 0.0;
  // no return statement needed
}

...
float x;
float y;

function(&x,&y);

printf("%f %f\n",x,y);

---