polynomials

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#define SIZE 50



int readFile(char array[]);
void menu(char choice,char array[]);



int main(){

        char array[SIZE];
        char choice;
        int flag=1;




        while(flag){


                readFile(array);

                menu(choice,array);


                system("CLS");
        }

        getch();


    return 0;


}


/* A function that reads the polynomials from file (sample.txt) */

/* INSIDE THE sample.txt is:
                             8x^9 + 5x^8 - 5x^6 + 2x^4 - 6x + 10
                             5x^9 - 7x^7 + 18x^6 - 4x^3 - 3x - 15
*/

int readFile(char array[]){



    int i;

    FILE *textFile;

    textFile=fopen("sample.txt","r");



    if(textFile !=NULL){


        while(!feof(textFile)){

            fgets(array,50,textFile);
            printf("First polynomial: %s",array);
            fgets(array,50,textFile);
            printf("Second polynomial: %s",array);
        }
        fclose(textFile);


    }
    else{

        printf("error!");
    }



    printf("\n");


}



/* just displaying menu and calling other functions */

void menu(char choice,char array[]){

    int sum=0;
    float average;


     printf("\n*****************************\n");
     printf("*      [A] Addition         *\n");
     printf("*      [S] Subtraction      *\n");
     printf("*      [D] Derivative       *\n");
     printf("*****************************\n");
     scanf("%c",&choice);




    switch(choice)
      {

        // i still haven't figure out how to extract the polynomial correctly that's why i can't make the functions
        case 'A':

            //polyaddition();
            getch();
            break;

        case 'S':

            //polysubtraction();
            getch();
            break;


        case 'D':

            //firstpolyderivative();
            //secondpolyderivative();
            getch();
            break;

     }

     getch();

}