`#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include "prog8_functions.h"

int main() {
   FILE* Volt = NULL;
   FILE* Resist = NULL;
   FILE* fp_output;
   char file1 [200]; //file of resistors
   char file2 [200]; //file of Voltages
   char fileout [200];
   int M;
   int p = 0;
   double a;
   double b;

   double I;
   double P;

   double c = 10000;
   double d = 10000;
   double e = 10000;
   double f = 0;
   double g = 0;
   double h = 0;
   double i = 0;
   double j = 0;
   double k = 0;

   do{
   printf("Enter name of file for resistor input:");
   scanf("%s", file1);

   if( Resist == NULL ){
   printf("Invalid file name\n");
   }

   else{
      M = M + 1;
   }

   }while (M != 1);
   do{

   printf("Enter name of file for voltage input:");
   scanf("%s", file2);

   if( Volt == NULL ) {
   printf("Invalid file name\n");
   }

   else{
      M = M + 1;
   }

   }while (M != 2);

   printf("Enter name of file for output:");
   scanf("%s", fileout);

   Volt = fopen(file1, "rb");
   Resist = fopen(file2, "rb");

   fp_output = fopen(fileout, "w");

   fprintf("           R (ohms)    V (volts)\n");

   do{
   fread(&a, sizeof(a), 1, Volt);
   fread(&b, sizeof(b), 1, Resist);
   fprintf("RV pair  %d:    %.2lf      %.2lf\n", p, a, b);
   p = p + 1;

   if(b < c ){
      c = b;
   }
   if(b > f ){
      f = b;
   }

   I = b / a;
   P = I * b;

   if(I < d ){
      c = b;
   }
   if(I > g ){
      f = b;
   }

   if(P < e ){
      c = b;
   }
   if(P > h ){
      f = b;
   }

   i = i + b;
   j = j + I;
   k = k + P;

   }while((fscanf(Volt, "%.2lf", &a) != EOF) && (fscanf(Resist, "%.2lf", &b) != EOF));

   i = i / (p + 1);
   j = j / (p + 1);
   k = k / (p + 1);

   fprintf("      Voltage     Current     Power\n");
   fprintf("MIN      %.2lf      %.4lf     %.4lf\n", c, d, e);
   fprintf("MAX     %.2lf      %.4lf    %.4lf\n", f, g, h);
   fprintf("AVG     %.2lf      %.4lf    %.4lf\n", i, j, k);

   //fwrite(userNums, sizeof(int), NUM_VALUES, outFile);

   fclose(Volt);
   fclose(Resist);
   fclose(fp_output);

    return 0;

}`