I am getting an error: In function `void delete_repeats(char*, int&)\': 50 C:\\D

Question

I am getting an error: In function `void delete_repeats(char*, int&)': 50 C:Dev-Cppch7_pp2.cpp `position_used' undeclared (firstuse this function) (Each undeclared identifier is reported only once for eachfunction it appears in.)    52 C:Dev-Cppch7_pp2.cpp name lookup of `i' changed for newISO `for' scoping    50 C:Dev-Cppch7_pp2.cpp using obsolete binding at`i'
Here is the program:
#include <iostream> //function prototypes void delete_repeats(char a[], int& size); bool find_char (char target, char a[], int size);
int main() {
  using namespace std;   char a[81] = "mary had a little lamb. its fleecewas white as snow.";   int size = 53;//sample main character size53
  cout << "Before: size = " << size<< " array = " << endl;   for (int i=0; i<size; i++)//output beforesize    {    cout << a[i];//outputs allcharacters    }    cout << endl;
   delete_repeats(a,size);//deletesrepeat
  cout << "After: size = "<< size<< "array = " << endl;   for (int i=0; i<size; i++)//output after newsize    {    cout << a[i];//output after removingextra characters, spaces    }    cout << endl;    return 0; }
// search array a[] for char target, up to indexsize-1. // If found, return true. Otherwise return false.
bool find_char (char target, char a[], int size)
{   for (int i=0; i < size; i++)    {    if (a[i] == target) return true;    }    return false; }    //Delete repeat characters from a[] and return // the new size in position_used. void delete_repeats(char a[], int& positions_used) {   int new_size = 0;   for (int i = 0; i < position_used; i++)   {       if (!find_char(a[i], a, new_size))    {    a[new_size] = a[i];    new_size++;    }    }    position_used = new_size; }           In function `void delete_repeats(char*, int&)': 50 C:Dev-Cppch7_pp2.cpp `position_used' undeclared (firstuse this function) (Each undeclared identifier is reported only once for eachfunction it appears in.)    52 C:Dev-Cppch7_pp2.cpp name lookup of `i' changed for newISO `for' scoping    50 C:Dev-Cppch7_pp2.cpp using obsolete binding at`i'
Here is the program:
#include <iostream> //function prototypes void delete_repeats(char a[], int& size); bool find_char (char target, char a[], int size);
int main() {
  using namespace std;   char a[81] = "mary had a little lamb. its fleecewas white as snow.";   int size = 53;//sample main character size53
  cout << "Before: size = " << size<< " array = " << endl;   for (int i=0; i<size; i++)//output beforesize    {    cout << a[i];//outputs allcharacters    }    cout << endl;
   delete_repeats(a,size);//deletesrepeat
  cout << "After: size = "<< size<< "array = " << endl;   for (int i=0; i<size; i++)//output after newsize    {    cout << a[i];//output after removingextra characters, spaces    }    cout << endl;    return 0; }
// search array a[] for char target, up to indexsize-1. // If found, return true. Otherwise return false.
bool find_char (char target, char a[], int size)
{   for (int i=0; i < size; i++)    {    if (a[i] == target) return true;    }    return false; }    //Delete repeat characters from a[] and return // the new size in position_used. void delete_repeats(char a[], int& positions_used) {   int new_size = 0;   for (int i = 0; i < position_used; i++)   {       if (!find_char(a[i], a, new_size))    {    a[new_size] = a[i];    new_size++;    }    }    position_used = new_size; }           50 C:Dev-Cppch7_pp2.cpp `position_used' undeclared (firstuse this function) (Each undeclared identifier is reported only once for eachfunction it appears in.)    52 C:Dev-Cppch7_pp2.cpp name lookup of `i' changed for newISO `for' scoping    50 C:Dev-Cppch7_pp2.cpp using obsolete binding at`i'
Here is the program:
#include <iostream> //function prototypes void delete_repeats(char a[], int& size); bool find_char (char target, char a[], int size);
int main() {
  using namespace std;   char a[81] = "mary had a little lamb. its fleecewas white as snow.";   int size = 53;//sample main character size53
  cout << "Before: size = " << size<< " array = " << endl;   for (int i=0; i<size; i++)//output beforesize    {    cout << a[i];//outputs allcharacters    }    cout << endl;
   delete_repeats(a,size);//deletesrepeat
  cout << "After: size = "<< size<< "array = " << endl;   for (int i=0; i<size; i++)//output after newsize    {    cout << a[i];//output after removingextra characters, spaces    }    cout << endl;    return 0; }
// search array a[] for char target, up to indexsize-1. // If found, return true. Otherwise return false.
bool find_char (char target, char a[], int size)
{   for (int i=0; i < size; i++)    {    if (a[i] == target) return true;    }    return false; }    //Delete repeat characters from a[] and return // the new size in position_used. void delete_repeats(char a[], int& positions_used) {   int new_size = 0;   for (int i = 0; i < position_used; i++)   {       if (!find_char(a[i], a, new_size))    {    a[new_size] = a[i];    new_size++;    }    }    position_used = new_size; }    #include <iostream> //function prototypes void delete_repeats(char a[], int& size); bool find_char (char target, char a[], int size);
int main() {
  using namespace std;   char a[81] = "mary had a little lamb. its fleecewas white as snow.";   int size = 53;//sample main character size53
  cout << "Before: size = " << size<< " array = " << endl;   for (int i=0; i<size; i++)//output beforesize    {    cout << a[i];//outputs allcharacters    }    cout << endl;
   delete_repeats(a,size);//deletesrepeat
  cout << "After: size = "<< size<< "array = " << endl;   for (int i=0; i<size; i++)//output after newsize    {    cout << a[i];//output after removingextra characters, spaces    }    cout << endl;    return 0; }
// search array a[] for char target, up to indexsize-1. // If found, return true. Otherwise return false.
bool find_char (char target, char a[], int size)
{   for (int i=0; i < size; i++)    {    if (a[i] == target) return true;    }    return false; }    //Delete repeat characters from a[] and return // the new size in position_used. void delete_repeats(char a[], int& positions_used) {   int new_size = 0;   for (int i = 0; i < position_used; i++)   {       if (!find_char(a[i], a, new_size))    {    a[new_size] = a[i];    new_size++;    }    }    position_used = new_size; }          

Explanation / Answer

for (int i = 0; i < position_used; i++) // "s" ismissing in position_used and in position_used = new_size; // "s" is missing
-Hope this helps - I corrected and it compileds

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