Question

5

How to compile c & c++ programs?

rated 0 times [ 5] [ 0] / answers: 1 / hits: 7675 / 1 Year ago, sat, december 10, 2022, 4:27:55

I read somewhere that I need to install 'build essential packager' & so I tried:

sudo apt-get install build-essential 

Reading package lists... Done

Building dependency tree       

Reading state information... Done

build-essential is already the newest version.

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

But the file still wont compile or run...

gcc -Wall -W -Werror factorial.cpp -o factorial.

gives me:

gcc -Wall -W -Werror factorial.cpp -o factorial.

factorial.cpp:3:22: fatal error: iostream.h: No such file or directory

compilation terminated

This is my piece of code:
//WAP to demonstrate static member for calculating factorial

    #include<iostream.h>    

    #include<conio.h>

class fact

{

int i;

    static int count;

    public : 

    void calculate()

    {

        long int fact1=1;

        count++;

        for(i=0;i<=count;i++)

        {

            fact1=fact1*i;

        }

        cout<<"

Factorial of"<<count<<"="<<fact1<<"

";

    }

};

int fact :: count;

void main()

{

    int i;

    clrscr();

    fact f;

    for(i=1;i<=15;i++)

    {

        f.calculate();

    }

    getch();

}

What shoud I do..???

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eballxeye

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2 Years ago

answered 1 Year ago exceeeelh · Accepted Answer

There are several issues with your test source package.

My guess is that you are trying to compile using slightly older C++ standards (gcc instead of g++) and probably based on a Windows routine (using conio).

I've tidied up the test program for you:

#include <iostream> /* dont need .h */    

using namespace std; /* use a namespace */

/* #include <conio.h>   this is a windows header - dont need */



class fact

{

int i;

    static int count;

    public : 

    void calculate()

    {

        long int fact1=1;

        count++;

        for (i = 2; i <= count; i++)

        {

            fact1 *= i;

        }

        cout << "

Factorial of " << count << '=' << fact1 << '

';

    }

};

int fact :: count;



int main(void) /* you had an invalid main declaration */

{

    int i;

    /* clrscr();  not necessary */

    fact f;

    for (i = 1; i <= 15; i++)

    {

        f.calculate();

    }

    /* getch(); not necessary */



    return 0; /* need to return a standard value */

}

then compile using

g++ factorial.cpp -o factorial