Hey, I'm pretty much almost done with this program, but I'm not sure how to clear a previous file (after opening it) in order to open a new one. My program is supposed to open a file with a maximum of 100 unordered decimals and allow the user to sort and/or search, or open a new file.
// This program is supposed to read a file with a maximum
// of 100 unordered decimal numbers and allows the user
// to sort the numbers and/or do a search.
# include <iostream>
# include <fstream>
# include <string>
using namespace std;
// Prototypes
void Instrucciones(void);
int menu(void);
bool CheckFile(string filename);
int ReadFile();
bool BubbleSort(float [], int);
bool SelectionSort(float [], int);
void LinearSearch(float [], float, float);
void BinarySearch(float [], int, float);
int main()
{
// Declaring variables
int opcion;
ifstream ListNumbers;
string filename;
int size = 0;
float array[100];
float numbers;
float value;
bool order;
// This while is so the program will keep looping as long as the option
// chosen is between 1-5.
while (opcion >= 1 || opcion <= 6){
// Display instructions
Instrucciones();
// Display menu
opcion = menu();
// Displays the option chosen by the user
cout << "You've chosen option: " << opcion << endl << endl;
if (opcion == 1){
cout << "Enter the name of the file: " << endl;
cin >> filename;
if (CheckFile(filename)==true){
ListNumbers.open(filename.c_str(),fstream::in);
while (!ListNumbers.eof()){
// Keeps reading the file until it ends
ListNumbers >> numbers;
if (ListNumbers){
array[size] = numbers;
//ListNumbers >> numbers;
cout << "The numbers are: " << array[size] << endl;
size++;
}
}
cout << "The amount of numbers in the file is: " << size << endl;
cout << "The file " << filename << " exists. " << endl;
order = false;
ListNumbers.close();
}
else {
cout << "The file doesn't exist." << endl;
}
}
else if(opcion == 2){
order = BubbleSort(array, size);
}
else if(opcion == 3){
order = SelectionSort(array, size);
}
else if(opcion == 4){
LinearSearch(array, numbers, value);
}
else if(opcion == 5){
if (order == true)
BinarySearch(array, size, value);
else if (order == false){
cout << "Please sort the numbers first. " << endl;
}
}
else {
return 0;
}
}
} // End main
// This function displays the instructions and the menu.
void Instrucciones(){
cout << "This program allows the user to create a class and input student records. \n" << endl;
}
int menu(){
int opcion;
cout << "Menu:" << endl;
cout << "\t1) Read File" << endl;
cout << "\t2) Bubble Sort" << endl;
cout << "\t3) Selection Sort" << endl;
cout << "\t4) Linear Search" << endl;
cout << "\t5) Binary Search" << endl;
cout << "\t6) Exit Program \n" << endl;
// Selection of the options; if the option chosen is great than 6
// or less than 1, then the program will ask the user for a number
// between 1-6.
do{
cout << "Choose an option from the Menu: " << endl;
cin >> opcion;
while ((opcion < 1) || (opcion > 6)){
cout << "Error: Choose between the options 1-6: " << endl;
cin >> opcion;
}
} while ((opcion < 1) || (opcion > 6));
return opcion;
}
bool CheckFile(string filename){
// This function verifies to see whether the class exists or not
ifstream ListNumbers;
ListNumbers.open(filename.c_str(),fstream::in);
if (ListNumbers.good()){
ListNumbers.close();
return true ;
}
return false;
}
bool BubbleSort(float array[], int size){
bool swap;
float temp;
do {
swap = false;
for (int i = 0; i < (size - 1); i++){
if (array[i] > array[i + 1]){
temp = array[i];
array[i] = array[i + 1];
array[i + 1] = temp;
swap = true;
}
}
} while (swap);
cout << "This is the array in ascending order: " << endl;
for (int i = 0; i < size; i++)
cout << array[i] << endl;
cout << endl;
return true;
}
bool SelectionSort(float array[], int size) {
int minIndex;
float minValue;
for (int startScan = 0; startScan < (size - 1); startScan++){
minIndex = startScan;
minValue = array[startScan];
for (int i = startScan + 1; i < size; i++){
if (array[i] < minValue){
minValue = array[i];
minIndex = i;
}
}
array[minIndex] = array[startScan];
array[startScan] = minValue;
}
cout << "This is the array in ascending order: " << endl;
for (int i = 0; i < size; i++)
cout << array[i] << endl;
cout << endl;
return true;
}
void LinearSearch(float array[], float numbers, float value){
int i = 0;
int position = -1;
bool found = false;
cout << "What is the number you are searching for? " << endl;
cin >> value;
while (i < numbers && !found){
if (array[i] == value){
found = true;
position = i;
}
i++;
}
if (position == -1)
cout << "The number does not exist. " << endl;
else {
cout << "The position of the number you are searching for is at: "
<< position << endl;
}
}
void BinarySearch(float array[], int size, float value){
int first = 0;
int last = size - 1;
int middle;
int position = -1;
bool found = false;
cout << "What is the number you are searching for? " << endl;
cin >> value;
while (!found && first <= last){
middle = (first + last) / 2;
if (array[middle] == value){
found = true;
position = middle;
}
else if (array[middle] > value)
last = middle - 1;
else
first = middle + 1;
}
if (position == -1)
cout << "The number does not exist. " << endl;
else {
cout << "The position of the number you are searching for is at: "
<< position << endl;
}
}Any help or hints would be appreciated, thanks.
