Thread: 2 largest elements; -1 to stop loop

Here's most of my program.

program is create a random generated array of 50 elements
elements are values 1-500

read_array function initializes new array of integers each time

print_array function prints current array after stopping program with entry of -1 from keyboard /// have no idea how to code this

Two_largest function takes array from read_array function and finds the two largest element values

finally the main() function is to print these values

(1) i do not know if the two largest values are to be printed for each and every array created before -1 stops program
and if so, how could you print out say
(2) what kind of code is used to scan in a -1 to stop program
-- my friend says that control-Z is used commonly, and
there is an ASCII code for that -- what is this???
(3) the whole program is to be one DO/WHILE Loop, I didn't know where to put that in the main() ; but assume it has something to do with the -1 stoppage component
(4) what are the int values for each function doing??? (the no-array and non-pointer int values is what I refer to here.)

Code:

   /*   Two largest integers  */
   /*   stop when -1 entered  */
 
 
   #include <stdio.h>
   #include <stdlib.h>
   #include <time.h>
   
   #define NUM_ELEM 50
   #define RANDOM_NUM 500
   
   void Two_largest(int array2[], int m, int *lg, int *lg2);
   void read_array(int array1[], int r);
   void print_array(int array3[], int p);
   
   srand (time(NULL));
   
   main()
   {
      int a, b, c;
      int read[NUM_ELEM]={0};
      int print[NUM_ELEM]={0};
      int sortedarray[NUM_ELEM]={0};
      int *largest;
      int *secondlargest;
   
      read_array(read,a);
      print_array(print,b);
      Two_largest(sortedarray, c, *largest, *secondlargest);
   
      printf("%d  %d\n", &largest, &secondlargest);
   
     }
   
   read_array(int array1[], int r)
   
   {
   
      int i;
   
      for (i=0; i<NUM_ELEM; i++)
   
          {
             array1[i]=rand()%RANDOM_NUM+1;
          }
    
    }
  
   print_array(int array3[], int p)
  
   {
       int i;
  
       for (i=0; i<NUM_ELEM; i++)
   void Two_largest(int array2[], int m, int *lg, int *lg2)
    {
      int i,j;
   
      for (i=o; i<NUM_ELEM; i++)
   
        {
           for (j=i+1; j<NUM_ELEM; j++)
   
           {
               temp = array2[i];
               array2[i] = array2[j];
               array2[j] = temp;
              }
           }
    
           *lg = array2[j];
           *lg2 = array2[j-1];
  }

I need to clarify:

the following prototypes of the functions used are required, with parameters as shown:


void Two_largest(int[], int , int *, int *);
void read_array(int [], int );
void print_array(int [], int );

My question was about the 'int' variables; not the arrays or pointers.

program from main calls the read_array first, initializes elements from random num generator, I am assuming passing the array back to main;

then main calls print_array func and prints the current array; then passes array again back to main

then main calls Two_largest function and then the fun begins, sorting and finding the two_largest element values of original array

My question again, is what are the parameters of the single int variable (not the int array or int pointer) for in each function called??? Does this have to do with the user input of -1 to stop program????

Salem:

A-ha I get it now (re: int variable = number elements in array).

Where would I put the code for the EOF to stop program???










Peachy