convert from one unit to another.

calculator.cbp

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<CodeBlocks_project_file>
	<FileVersion major="1" minor="6" />
	<Project>
		<Option title="calculator" />
		<Option pch_mode="2" />
		<Option compiler="gcc" />
		<Build>
			<Target title="Debug">
				<Option output="bin/Debug/calculator" prefix_auto="1" extension_auto="1" />
				<Option object_output="obj/Debug/" />
				<Option type="1" />
				<Option compiler="gcc" />
				<Compiler>
					<Add option="-g" />
				</Compiler>
			</Target>
			<Target title="Release">
				<Option output="bin/Release/calculator" prefix_auto="1" extension_auto="1" />
				<Option object_output="obj/Release/" />
				<Option type="1" />
				<Option compiler="gcc" />
				<Compiler>
					<Add option="-O2" />
				</Compiler>
				<Linker>
					<Add option="-s" />
				</Linker>
			</Target>
		</Build>
		<Compiler>
			<Add option="-Wall" />
			<Add option="-fexceptions" />
		</Compiler>
		<Unit filename="main.cpp" />
		<Extensions>
			<code_completion />
			<envvars />
			<debugger />
		</Extensions>
	</Project>
</CodeBlocks_project_file>

calculator.depend

# depslib dependency file v1.0
1420478916 source:c:\users\taiwo\desktop\grading program\calculator\main.cpp
	<iostream>

calculator.layout

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<CodeBlocks_layout_file>
	<ActiveTarget name="Debug" />
	<File name="main.cpp" open="1" top="1" tabpos="1" split="0" active="1" splitpos="0" zoom_1="0" zoom_2="0">
		<Cursor>
			<Cursor1 position="1844" topLine="0" />
		</Cursor>
		<Folding>
			<Collapse line="4" />
			<Collapse line="9" />
			<Collapse line="43" />
			<Collapse line="45" />
			<Collapse line="78" />
			<Collapse line="99" />
		</Folding>
	</File>
</CodeBlocks_layout_file>

main.cpp

#include <iostream>

using namespace std;

class Measure{
    double m_value;
    double centimeter, meter, feet, inch;
    int unit;
    public:
    Measure(double &val, int &un):m_value(val), unit(un) {
    switch(unit){
    case 1:
        meter = m_value;
        centimeter = meter * 100;
        inch = centimeter / 2.54;
        feet = inch /12;
        break;
    case 2:
        centimeter = m_value;
        meter = centimeter/100;
        inch = centimeter / 2.54;
        feet = inch /12;
        break;
    case 3:
        inch = m_value;
        centimeter = inch * 2.54;
        meter = centimeter * 100;
        feet = inch /12;
        break;
    case 4:
        feet = m_value;
        inch = feet * 12;
        centimeter = inch * 2.54;
        meter = centimeter * 100;
        break;
    default:
        break;
    }
}
    void print();

};

void Measure::print(){

    switch (unit) {
    case 1:
        cout <<m_value << " meter(s) is equal to:\n"
        << centimeter <<" centimeters\n"
        << inch <<" inches\n"
        << feet <<" feets\n";
        break;
    case 2:
        cout <<m_value << " centimeter(s) is equal to:\n"
        << meter <<" meter(s)\n"
        << inch <<" inche(s)\n"
        << feet <<" feet(s)\n";
        break;
    case 3:
        cout <<m_value << " inch(s) is equal to:\n"
        << feet <<" feet(s)\n"
        << centimeter <<" centimeter(s)\n"
        << meter <<" meter(s)\n";
        break;
    case 4:
        cout <<m_value << " feets(s) is equal to:\n"
        << inch <<" inch(s)\n"
        << centimeter <<" centimeter(s)\n"
        << meter <<" meter(s)\n";
        break;
    }
    }




void takeunit(int &unit);
int main()
{
    double value;
    int unit;
    takeunit(unit);

    do{
    if (unit>0 && unit <5) {
    cout << "Enter Value" << endl;
    cin >> value;
    Measure neew(value,unit);
    neew.print();
    takeunit(unit);
     }
    else {
        cout << "Invalid Unit choice.";
        takeunit(unit);
    }

    }while (unit!=0);
}

void takeunit(int &unit) {
    cout << "Convert from:\n1 - Meters.\n2 - Centimeters.\n3 - Inches.\n4 - Feets."  << endl;
    cin >> unit;
}