Arrays in C (setting a double equal to an array?

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C

Hi i am writing a series of if statements that determine which set of coordinates is the has the max value.

I have a formula that calculates the max value of z and by using coordinates of (x,y). Ie z= (2*y)+x
that works well. I then need to be able to get it so that the program tells me which set of coordinates it used to get that z value. (there are 3 pairs of coordinates).

The coordinates are given to us and i just want the max coordinates to be called a new variable.

I haven't included the whole code as its very long as I'm doing other stuff there as well but i think i gave all the info needed...

The program has already calculated z0, z1,z2, max successfully
Coordinates are defined like this at the start:
double P0 [] = {7,8};
double P1 [] = {2,4};
double P2 [] = {3,2};

I just need max to contain the array of the coordinates that give me the value for zmax.

Thanks!!

What I have tried:

if (zmax==z0){
            max=P0[];
        } else if (zmax==z1){
            max=P1[];
        } else {
            max=P2[];
        }

        printf("ph is %f/n",max[0],max[1]);

NEW VERSION:

float maxformula (float z0, float z1, float z2, float zmax,float P0[], float P1[], float P2[]);
float maxformula (float z0, float z1, float z2, float zmax,float P0[], float P1[], float P2[]){


    if (zmax==z0){
        printf("zmax is zo");
        double max[]={P0[0],P0[1]};
printf("max is %f %f\n", max[0],max[1]);
    } else if (zmax==z1){
        printf("zmax is z1\n");
        double max[]={P1[0],P1[1]};
        printf("max is %f %f\n", max[0],max[1]);
    } else if (zmax==z2){
        printf("zmax is z2");
        double max[]={P2[0],P2[1]};
printf("max is %f %f\n", max[0],max[1]);
   }

}

In the main:

maxformula(z0,z1,z2,zmax,P0,P1,P2);

For some reason gives me the correct values but the x and y are flipped (so the max[0] is the y max[1] is the x