C++ function not found during compilation
- by forthewinwin
For a homework assignment: I'm supposed to create randomized alphabetial keys, print them to a file, and then hash each of them into a hash table using the function "goodHash", found in my below code.
When I try to run the below code, it says my "goodHash" "identifier isn't found". What's wrong with my code?
#include <iostream>
#include <vector>
#include <cstdlib>
#include "math.h"
#include <fstream>
#include <time.h>
using namespace std;
// "makeKey" function to create an alphabetical key
// based on 8 randomized numbers 0 - 25.
string makeKey() {
int k;
string key = "";
for (k = 0; k < 8; k++) {
int keyNumber = (rand() % 25);
if (keyNumber == 0)
key.append("A");
if (keyNumber == 1)
key.append("B");
if (keyNumber == 2)
key.append("C");
if (keyNumber == 3)
key.append("D");
if (keyNumber == 4)
key.append("E");
if (keyNumber == 5)
key.append("F");
if (keyNumber == 6)
key.append("G");
if (keyNumber == 7)
key.append("H");
if (keyNumber == 8)
key.append("I");
if (keyNumber == 9)
key.append("J");
if (keyNumber == 10)
key.append("K");
if (keyNumber == 11)
key.append("L");
if (keyNumber == 12)
key.append("M");
if (keyNumber == 13)
key.append("N");
if (keyNumber == 14)
key.append("O");
if (keyNumber == 15)
key.append("P");
if (keyNumber == 16)
key.append("Q");
if (keyNumber == 17)
key.append("R");
if (keyNumber == 18)
key.append("S");
if (keyNumber == 19)
key.append("T");
if (keyNumber == 20)
key.append("U");
if (keyNumber == 21)
key.append("V");
if (keyNumber == 22)
key.append("W");
if (keyNumber == 23)
key.append("X");
if (keyNumber == 24)
key.append("Y");
if (keyNumber == 25)
key.append("Z");
}
return key;
}
// "makeFile" function to produce the desired text file.
// Note this only works as intended if you include the ".txt" extension,
// and that a file of the same name doesn't already exist.
void makeFile(string fileName, int n) {
ofstream ourFile;
ourFile.open(fileName);
int k; // For use in below loop to compare with n.
int l; // For use in the loop inside the below loop.
string keyToPassTogoodHash = "";
for (k = 1; k <= n; k++) {
for (l = 0; l < 8; l++) { // For-loop to write to the file ONE key
ourFile << makeKey()[l];
keyToPassTogoodHash += (makeKey()[l]);
}
ourFile << " " << k << "\n";// Writes two spaces and the data value
goodHash(keyToPassTogoodHash); // I think this has to do with the problem
makeKey(); // Call again to make a new key.
}
}
// Primary function to create our desired file!
void mainFunction(string fileName, int n) {
makeKey();
makeFile(fileName, n);
}
// Hash Table for Part 2
struct Node {
int key;
string value;
Node* next;
};
const int hashTableSize = 10;
Node* hashTable[hashTableSize];
// "goodHash" function for Part 2
void goodHash(string key) {
int x = 0;
int y;
int keyConvertedToNumber = 0;
// For-loop to produce a numeric value based on the alphabetic key,
// which is then hashed into hashTable using the hash function
// declared below the loop (hashFunction).
for (y = 0; y < 8; y++) {
if (key[y] == 'A' || 'B' || 'C')
x = 0;
if (key[y] == 'D' || 'E' || 'F')
x = 1;
if (key[y] == 'G' || 'H' || 'I')
x = 2;
if (key[y] == 'J' || 'K' || 'L')
x = 3;
if (key[y] == 'M' || 'N' || 'O')
x = 4;
if (key[y] == 'P' || 'Q' || 'R')
x = 5;
if (key[y] == 'S' || 'T')
x = 6;
if (key[y] == 'U' || 'V')
x = 7;
if (key[y] == 'W' || 'X')
x = 8;
if (key[y] == 'Y' || 'Z')
x = 9;
keyConvertedToNumber = x + keyConvertedToNumber;
}
int hashFunction = keyConvertedToNumber % hashTableSize;
Node *temp;
temp = new Node;
temp->value = key;
temp->next = hashTable[hashFunction];
hashTable[hashFunction] = temp;
}
// First two lines are for Part 1, to call the functions key to Part 1.
int main() {
srand ( time(NULL) ); // To make sure our randomization works.
mainFunction("sandwich.txt", 5); // To test program
cin.get();
return 0;
}
I realize my code is cumbersome in some sections, but I'm a noob at C++ and don't know much to do it better.
I'm guessing another way I could do it is to AFTER writing the alphabetical keys to the file, read them from the file and hash each key as I do that, but I wouldn't know how to go about coding that.
