Return not working?

I really hate to ask this but could someone look this over and see if I did something wrong as far as why the functions do not return right?

Code:

---

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <ctime>
using namespace std;

void random();  void multiples();  void numbers();

//------------------------------------------
int main() {
//------------------------------------------
cout<< "Pick a program to do. Enter 0 to quit.\n";
cout<< "Choice 1 - random selection\nChoice 2 - multiples\nChoice 3 - Number counting\n";
int choice=cin.get();
do{
 switch (choice) {
  case '1': random(); break;
  case '2': multiples(); break;
  case '3': numbers(); break;
  default: cout<< "Try again  ";
 }
}while (choice != 0);
return 0;
}

//------------------------------------------
void random() {
//------------------------------------------
int score[101];
int frequency[101];
int upick=1;

while (upick!=0) {
//copy 0 into the first 101 bytes of score and frequency
memset(score, 0, 101*sizeof(int));
memset(frequency, 0, 101*sizeof(int));
cout<< "Pick a number between 1 and 100 and I will randomly select them and "<< endl
<< "then I will output the results.\n\nPick a number between 1 and 100: ";
cin>> upick; cout<< endl;
srand(time(0));
// Score entering loop
int entered=0, l=0;
    for (int i=0; i<101; i++) {
    score[i]=1+rand()%upick;
        entered++;
        if (score[i]>0){
          cout << score[i]<< "\t"; ++l;
        }
        if (l==9) {
          l=0;  cout<< "\n";
        }
        }

cout<< "\n\n"; system("PAUSE");

// Score counting loop
      for (int i=0; i < entered; i++)
                ++frequency[score[i]];

        cout << "SCORE" << setw(13) << "FREQUENCY" << setw(8)<< "GRAPH"<< endl;
// Score output loop
    for (int i=0; i < 101; i++) {
                if (frequency[i]>0) {
                        cout<< setw(7) << i << setw(8) << frequency[i]<< setw(6)<< " ";
// Print graph
                        for(int j=0; j < frequency[i]; j++) {
                                cout << '*';
                        }
                        cout << endl;
                }
        }
cout<<"QUIT? Enter 0=yes  1=no: "; cin>> upick;
}
return;
}
//------------------------------------------
void multiples() {
//------------------------------------------
cout<<"Enter in a number between 1 and 12100 and I will calculate the multiples of\nthat number up to 86.  Press -1 to quit.\n";
    for (int y; y<12100;) {
    cout<<"\n0 to quit. Your number: "; cin>> y;
      while (y>12100) {cout<<"too big\n"; cin>>y;}
      if (y<1) break;
      int z=0; cout<< "\n";
      for (int x=1; x<86; ++x) {
      if (z>=4) {cout<< "\n"; z=0;}
      cout << x<< "*"<< y<< "= " << x*y << setw(5);
      ++z;
      }
    y=0;  cout<< endl;
    }
return;
}

//------------------------------------------
void numbers() {
//------------------------------------------
int score[1000001];
int frequency[1000001];
int temp=1;

while (temp!=0) {
//copy 0 into the first 1000001 bytes of score and frequency
memset(score, 0, 1000001*sizeof(int));
memset(frequency, 0, 1000001*sizeof(int));

cout << "This program will allow you to enter in 1 million numbers up to a value "<< endl
<< "of 1 million and it will chart how many times you entered in that number."<< endl
<< "\nEnter scores (Limit: 1000000):\n";
// Score entering loop
    int entered=0;
        for (int i=0; i < 1000001; i++) {
                cout << "Enter 0 when finished. Next score: ";
                cin >> temp;
                while(temp > 1000000) {
                        cout << "Score out of range. Enter again: ";
                        cin >> temp;
                }
                if (temp<1)
                        break;
                score[i] = temp;
                entered++;
        }
// Score counting loop
        for (int i=0; i < entered; i++)
    ++frequency [score[i]];

        cout << "\nSCORE" << setw(13) << "FREQUENCY" << setw(8)<< "GRAPH"<< endl;
// Score output loop
        for (int i=0; i < 1000001; i++) {
                if (frequency[i]>0) {
                        cout<< setw(7) << i << setw(8) << frequency[i]<< setw(6)<< " ";
// Print graph
                        for(int j=0; j < frequency[i]; j++) {
                                cout << '*';
                        }
                        cout << endl;
                }
    }
cout<< "QUIT? 0=yes  1=no  "; cin>> temp;
}
return;
}

---

Aren't your header files supposed to have an h at the end like this:

#include <blah.h>

I don't know though because I am like totally new to C++

No they aren't.

Again you have the score and frequency arrays inside a function. This function will crash when called.

I thought that was only for main() but I did fix it. It still does the same exact thing.

Here is what someone else said:
You set the functions to void, therefore u cannot return anything unless you have a pointer.

So I also changed the functions to int and had to remove return alltogether to even get it to compile. But it still does not return.

No, no. You can't return a value. That means you can't write
return 5;

But
return;
doesn't return a value, it simply returns control to the caller - that is, it exits the function.

return;
directly followed by the closing brace (}) of the function is redundant.

What do you mean they don't return?
The problem is that you don't give the user a chance to give a different command after one function executed. That means that the
do...while() loop in main is infinite once entered because choice doesn't change.

The stack limit applies for each and every function.

Finished!! Thank you cornedbee. I learned something.

Code:

---

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <ctime>
using namespace std;

void random();  void multiples();  void numbers();

//------------------------------------------
int main() {
//------------------------------------------
char choice;
do{
cout<< "\nPick a program to do. Enter 0 to quit.\n";
cout<< "Choice 1 - random selection\nChoice 2 - multiples\nChoice 3 - Number counting\n";
cin>> choice;
 switch (choice) {
  case '1': random(); break;
  case '2': multiples(); break;
  case '3': numbers(); break;
  default: cout<< "Try again  ";
 }
}while (choice != '0');
return 0;
}


int scoreR[101];
int frequencyR[101];
//------------------------------------------
void random() {
//------------------------------------------
int upick=1;

while (upick!=0) {
//copy 0 into the first 101 bytes of scoreR and frequencyR
memset(scoreR, 0, 101*sizeof(int));
memset(frequencyR, 0, 101*sizeof(int));
cout<< "Pick a number between 1 and 100 and I will randomly select them and "<< endl
<< "then I will output the results.\n\nPick a number between 1 and 100: ";
cin>> upick; cout<< endl;
srand(time(0));
// Score entering loop
int entered=0, l=0;
    for (int i=0; i<101; i++) {
    scoreR[i]=1+rand()%upick;
        entered++;
        if (scoreR[i]>0){
          cout << scoreR[i]<< "\t"; ++l;
        }
        if (l==9) {
          l=0;  cout<< "\n";
        }
        }

cout<< "\n\n"; system("PAUSE");

// Score counting loop
      for (int i=0; i < entered; i++)
                ++frequencyR[scoreR[i]];

        cout << "SCORE" << setw(13) << "FREQUENCY" << setw(8)<< "GRAPH"<< endl;
// Score output loop
    for (int i=0; i < 101; i++) {
                if (frequencyR[i]>0) {
                        cout<< setw(7) << i << setw(8) << frequencyR[i]<< setw(6)<< " ";
// Print graph
                        for(int j=0; j < frequencyR[i]; j++) {
                                cout << '*';
                        }
                        cout << endl;
                }
        }
cout<<"QUIT? Enter 0=yes  1=no: "; cin>> upick;
}

}
//------------------------------------------
void multiples() {
//------------------------------------------
cout<<"Enter in a number between 1 and 12100 and I will calculate the multiples of\nthat number up to 86.  Press -1 to quit.\n";
    for (int y=0; y<12100;) {
    cout<<"\n0 to quit. Your number: ";
    cin>> y;
      while (y>12100) {
      cout<<"too big\n"; cin>>y;
      }
      if (y<1) break;
      int z=0; cout<< "\n";
      for (int x=1; x<86; ++x) {
      if (z>=4) {cout<< "\n"; z=0;}
      cout << x<< "*"<< y<< "= " << x*y << setw(5);
      ++z;
      }
    y=0;  cout<< endl;
    }

}


int scoreN[1000001];
int frequencyN[1000001];
//------------------------------------------
void numbers() {
//------------------------------------------
int temp=1;

while (temp!=0) {
//copy 0 into the first 1000001 bytes of scoreN and frequencyN
memset(scoreN, 0, 1000001*sizeof(int));
memset(frequencyN, 0, 1000001*sizeof(int));

cout << "This program will allow you to enter in 1 million numbers up to a value "<< endl
<< "of 1 million and it will chart how many times you entered in that number."<< endl
<< "\nEnter scores (Limit: 1000000):\n";
// Score entering loop
    int entered=0;
        for (int i=0; i < 1000001; i++) {
                cout << "Enter 0 when finished. Next score: ";
                cin >> temp;
                while(temp > 1000000) {
                        cout << "Score out of range. Enter again: ";
                        cin >> temp;
                }
                if (temp<1)
                        break;
                scoreN[i] = temp;
                entered++;
        }
// Score counting loop
        for (int i=0; i < entered; i++)
    ++frequencyN [scoreN[i]];

        cout << "\nSCORE" << setw(13) << "FREQUENCY" << setw(8)<< "GRAPH"<< endl;
// Score output loop
        for (int i=0; i < 1000001; i++) {
                if (frequencyN[i]>0) {
                        cout<< setw(7) << i << setw(8) << frequencyN[i]<< setw(6)<< " ";
// Print graph
                        for(int j=0; j < frequencyN[i]; j++) {
                                cout << '*';
                        }
                        cout << endl;
                }
    }
cout<< "QUIT? 0=yes  1=no  "; cin>> temp;
}

}

---