Computer Programming/Arrays/C++

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arrays.cpp[edit]

// This program uses arrays to display temperature conversion tables 
// and temperature as an array subscript to find a given conversion.

#include <iostream>

using namespace std;

void buildC(double c[], int size);
void buildF(double f[], int size);
void displayArray(string name, double array[], int size);
void findTemperature(double c[], int c_size, double f[], int f_size);
int minimum(int value1, int value2);

int main() 
{
    double c[101];
    double f[213];
    
    buildC(c, sizeof(c) / sizeof(double));
    buildF(f, sizeof(f) / sizeof(double));
    displayArray(string("C"), c, sizeof(c) / sizeof(double));
    displayArray(string("F"), f, sizeof(f) / sizeof(double));
    findTemperature(c, sizeof(c) / sizeof(double), 
        f, sizeof(f) / sizeof(double));
}

void buildC(double c[], int size)
{
    int index;
    double value;
    
    for (index = 0; index <= size - 1; index += 1) 
    {
        value = (double) index * 9 / 5 + 32;
        c[index] = value;
    }
}

void buildF(double f[], int size)
{
    int index;
    double value;
    
    for (index = 0; index <= size - 1; index += 1) 
    {
        value = (double) (index - 32) * 5 / 9;
        f[index] = value;
    }
}

void displayArray(string name, double array[], int size)
{
    int index;
    
    for (index = 0; index <= size - 1; index += 1) 
    {
        cout << name << "[" << index << "] = " << array[index] << endl;
    }
}

void findTemperature(double c[], int c_size, double f[], int f_size)
{
    int temp;
    int size;
    
    size = minimum(c_size, f_size);
    do 
    {
        cout << "Enter a temperature between 0 and " << size - 1 << endl;
        cin >> temp;
    } while (temp < 0 || temp > size - 1);
    cout << temp << "° Celsius is " << c[temp] << "° Fahrenheit" << endl;
    cout << temp << "° Fahrenheit is " << f[temp] << "° Celsius" << endl;
}

int minimum(int value1, int value2)
{
    int result;
    
    if (value1 < value2)
    {
        result = value1;
    }
    else
    {
        result = value2;
    }
    
    return result;
}

Try It[edit]

Copy and paste the code above into one of the following free online development environments or use your own C++ compiler / interpreter / IDE.

See Also[edit]