Free Programming Source Codes and Computer Programming Tutorials

Monday, July 1, 2019

Math Calculator in PHP

Here is a simple math calculator that can perform basic arithmetic operations like addition, subtraction, multiplication, and division using CSS, HTML, and PHP.

I am currently accepting programming work, IT projects, school and application development, programming projects, thesis and capstone projects, IT consulting work, computer tutorials, and web development work kindly contact me in the following email address for further details. If you want to advertise on my website kindly contact me also in my email address also. Thank you.

My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

My telephone number at home here in Bacolod City, Negros Occidental Philippines is +63 (034) 4335675.

Here in Bacolod I also accepting computer repair, networking and Arduino Project development at a very affordable price.

My personal website is http://www.jakerpomperada.com

Sample Program Output

Program Listing

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Calculator in PHP</title>

<!--

.btn {color: #0000CC; border: #FF0000 1px solid; width:150px; height:35px; font-family:Verdana, Arial, Helvetica, sans-serif;

font-size:20px;}

.button {background-color: #999999; border:#999900 1px solid; width:100px; height:30px; color:#FFF; font-style:bold;}

.h1 {font-family:Verdana, Arial, Helvetica, sans-serif ; font-size:24px; color:#FFFFFF;}

.label {font-family:Verdana, Arial, Helvetica, sans-serif; font-size:20px;}

.style3 {color: #FF0000; font-weight: bold; font-size:25px; }

.style4 {color: #FF0000; font-style: italic ; font-size:12px ; padding-left:20px;}

.tr {background-color: #999999;}

.tr1 {background-color: #CC9900; border: #CCCCCC 1px solid; height:30px;}

.style12 {background-color: #999999; color: #CCFF00; }

.style14 {font-size: 24px; color: #CCFF00; }

-->

body {

font-family:arial;

}

</style>

<!--

function MM_callJS(jsStr) { //v2.0

return eval(jsStr)

}

//-->

</script>

</head>

<body >

<?php

error_reporting(0);

//start of the code of PHP Main

if (isset($_POST['Submit'])) // set the submit button when click

{

$value1=$_POST['value1']; // setting variables of the field 1 and field 2

$value2=$_POST['value2'];

$operation=$_POST['operatorbutton']; //setting up variables with radio button

$Fresult='';

if ($value1=='' ) { //check the field if it is empty and post it with javascript msgbox

echo '<script language="javascript" >' ;

echo 'alert("Field 1 is required");';

echo' </script>';

}

if ($value2=='') { //check the field if it is empty and post it with javascript msgbox

echo '<script language="javascript" >' ;

echo 'alert("Field 2 is required");';

echo' </script>';

}

//start of the operation

if ($operation=='') {

echo '<script language="javascript" >' ;

echo 'alert("Division of zero is not allowed");';

echo' </script>';} //checking of operator if it is null

elseif($operation == 'add') {

//addition

$Fresult=$value1+$value2;}

elseif ($operation == 'sub') {

//subtraction

$Fresult=$value1-$value2;}

elseif ($operation == 'mul') {

//multiplication

$Fresult=$value1*$value2;}

elseif ($operation == 'div')

//division

{

// checking if if is divided in zero and post it in a javascript

if ($value2 =='0')

{

echo '<script language="javascript" >' ;

echo 'alert("Division of zero is not allowed");';

echo' </script>';

}

else //else perform division

{$Fresult=$value1/$value2;}

}

//setting all radio button to unchecked

$add = 'unchecked';

$subtract = 'unchecked';

$multiply = 'unchecked';

$divide = 'unchecked';

//setting variable for selected operator button

$selected_button = $_POST['operatorbutton'];

if ($selected_button == 'add')

{

$add = 'checked';

}

else if ($selected_button == 'sub')

{

$subtract = 'checked';

}

else if ($selected_button == 'mul')

{

$multiply = 'checked';

}

else if ($selected_button == 'div')

{

$divide = 'checked';

}

} //end of main

<tr>

<th colspan="3" bgcolor="#CC6600" scope="col" class="tr1"><h1 class="h1">Calculator in PHP</h1></th>

</tr >

<tr>

<td width="26%"><div align="right" class="label">First Number </div></td>

<td width="73%" ><input name="value1" type="text" class="btn" id="value1" value="<?php echo trim($_POST['value1']); ?>" onkeypress=" return isNumberKey(event)" /></td>

</tr>

<tr>

<td height="30"><div align="right" class="label">Second Number </div></td>

<td><input name="value2" type="text" class="btn" id="value2" value="<?php echo trim( $_POST['value2']); ?>" onkeypress=" return isNumberKey(event)"/></td>

</tr>

<td height="24"><div align="right" class="label">Math Operator</div></td>

<td >

<input name="operatorbutton" type="radio" checked="checked" <?PHP print $add; ?>; value="add" />

Addition

Subtraction

Multiplication

Division</span><span class="style14"> </span></td>

</tr>

<tr>

<td height="26"><div align="right" class="label">Result</div></td>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

function isNumberKey(evt)

{

var charCode = (evt.which) ? evt.which : event.keyCode

if (charCode > 31 && (charCode < 45 || charCode > 57))

return false;

return true;

} </script>

function cleartext()

{

var form = document.forms[0];

//purpose?: to make the form textfield in to null

form.value1.value = "";

form.value2.value = "";

} </script>

Decimal To Roman Numeral Converter in Visual Basic 6

Here is a program that will allow that user to convert decimal into Roman numeral using Visual Basic 6 is also a code for conversion in Permutation.

I am currently accepting programming work, IT projects, school and application development, programming projects, thesis and capstone projects, IT consulting work, computer tutorials, and web development work kindly contact me in the following email address for further details. If you want to advertise on my website kindly contact me also in my email address also. Thank you.

My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

My telephone number at home here in Bacolod City, Negros Occidental Philippines is +63 (034) 4335675.

Here in Bacolod I also accepting computer repair, networking and Arduino Project development at a very affordable price.

My personal website is http://www.jakerpomperada.com

Sample Program Output

DOWNLOAD SOURCE CODE HERE

Telephone Billing System in C

Here is a simple telephone billing system that I wrote in C programming language that performs basic database operation CRUD (Create, Retrieve, Update and Delete) through a text file. The code will work in Dev C++ compiler that is free to download over the Internet.

My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

My telephone number at home here in Bacolod City, Negros Occidental Philippines is +63 (034) 4335675.

Here in Bacolod I also accepting computer repair, networking and Arduino Project development at a very affordable price.

My personal website is http://www.jakerpomperada.com

Sample Program Output

Program Listing

telephone.c

/* Jake R. Pomperada */

/* July 1, 2019 */

#include<stdio.h>

#include<conio.h>

#include<ctype.h>

#include<windows.h>

#include<stdlib.h>

struct subscriber

{

char phonenumber[20];

char name[50];

float amount;

}s;

void addrecords();

void listrecords();

void modifyrecords();

void deleterecords();

void searchrecords();

void payment();

char get;

int main()

{

int phonenumber;

char choice;

while (1)

{

system("cls");

printf("\n **********************************************");

printf("\n **** TELEPHONE BILLING MANAGEMENT SYSTEM ****");

printf("\n ***********************************************");

printf("\n");

printf("\n\t A : Adding new records.\n \t L : Listing of records");

printf("\n\t M : Modifying records.\n \t P : Payments");

printf("\n\t S : Searching records.");

printf("\n\t D : Deleting records.\n\t E : Exit Program\n");

printf("\n");

printf("\n\t PLEASE SELECT THE LETTERS ONLY " );

choice=getche();

choice=toupper(choice);

switch(choice)

{

case 'P':

payment();break;

case 'A' :

addrecords();break;

case 'L' :

listrecords();break;

case 'M':

modifyrecords();break;

case 'S' :

searchrecords();break;

case 'D':

deleterecords();break;

case 'E':

system("cls");

printf("\n\n\t\t\t\tTHANK YOU");

printf("\n\n\n\n\n:\n\tFOR USING OUR SERVICE");

Sleep(2000);

exit(0);

break;

default:

system("cls");

printf("Incorrect Input");

printf("\nAny key to continue");

getch();

}

void addrecords()

{

FILE *f;

char test;

f=fopen("data.dat","ab+");

if(f==0)

{ f=fopen("data.dat","wb+");

system("cls");

printf("please wait while we configure your computer");

printf("/npress any key to continue");

getch();

}

while(1)

{

system("cls");

printf("\n Enter phone number:");

scanf("%s",&s.phonenumber);

printf("\n Enter name:");

fflush(stdin);

scanf("%[^\n]",&s.name);

printf("\n Enter amount:");

scanf("%f",&s.amount);

fwrite(&s,sizeof(s),1,f);

fflush(stdin);

system("cls");

printf("1 record successfully added");

printf("\n Press esc key to exit, any other key to add other record:");

test=getche();

if(test==27)

break;

}

fclose(f);

}

void listrecords()

{

FILE *f;

int i;

if((f=fopen("data.dat","rb"))==NULL)

exit(0);

system("cls");

printf("Phone Number\t\tUser Name\t\t\tAmount\n");

for(i=0;i<79;i++)

printf("-");

while(fread(&s,sizeof(s),1,f)==1)

{

printf("\n%-10s\t\t%-20s\t\t $. %.2f /-",s.phonenumber,s.name,s.amount);

}

printf("\n");

for(i=0;i<79;i++)

printf("-");

fclose(f);

getch();

}

void deleterecords()

{

FILE *f,*t;

int i=1;

char phonenumber[20];

if((t=fopen("temp.dat","w+"))==NULL)

exit(0);

if((f=fopen("data.dat","rb"))==NULL)

exit(0);

system("cls");

printf("Enter the phone number to be deleted from the Database");

fflush(stdin);

scanf("%[^\n]",phonenumber);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{ i=0;

continue;

}

else

fwrite(&s,sizeof(s),1,t);

}

if(i==1)

{ system("cls");

printf("Phone number \"%s\" not found",phonenumber);

remove("data.dat");

rename("temp.dat","data.dat");

getch();

fclose(f);

fclose(t);

main();

}

remove("data.dat");

rename("temp.dat","file.dat");

system("cls");

printf("The Number %s Successfully Deleted!!!!",phonenumber);

fclose(f);

fclose(t);

getch();

}

void searchrecords()

{

FILE *f;

char phonenumber[20];

int flag=1;

f=fopen("data.dat","rb+");

if(f==0)

exit(0);

fflush(stdin);

system("cls");

printf("Enter Phone Number to search in our database");

scanf("%s", phonenumber);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{ system("cls");

printf(" Record Found ");

printf("\n\nPhonenumber: %s\nName: %s\nAmount: $ %0.2f\n",s.phonenumber,s.name,s.amount);

flag=0;

break;

}

else if(flag==1)

{ system("cls");

printf("Requested Phone Number Not found in our database");

}

getch();

fclose(f);

}

void modifyrecords()

{

FILE *f;

char phonenumber[20];

long int size=sizeof(s);

if((f=fopen("data.dat","rb+"))==NULL)

exit(0);

system("cls");

printf("Enter phone number of the subscriber to modify:");

scanf("%[^\n]",phonenumber);

fflush(stdin);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{

system("cls");

printf("\n Enter phone number:");

scanf("%s",&s.phonenumber);

printf("\n Enter name: ");

fflush(stdin);

scanf("%[^\n]",&s.name);

printf("\n Enter amount: ");

scanf("%f",&s.amount);

fseek(f,-size,SEEK_CUR);

fwrite(&s,sizeof(s),1,f);

break;

}

fclose(f);

}

void payment()

{

FILE *f;

char phonenumber[20];

long int size=sizeof(s);

float amt;

int i;

if((f=fopen("data.dat","rb+"))==NULL)

exit(0);

system("cls");

printf("Enter phone number of the subscriber for payment");

scanf("%[^\n]",phonenumber);

fflush(stdin);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{

system("cls");

printf("\n Phone No.: %s",s.phonenumber);

printf("\n Name: %s",s.name);

printf("\n Current amount: %f",s.amount);

printf("\n");

for(i=0;i<79;i++)

printf("-");

printf("\n\nEnter amount of payment :");

fflush(stdin);

scanf(" %f",&amt);

s.amount=(amt-s.amount);

fseek(f,-size,SEEK_CUR);

fwrite(&s,sizeof(s),1,f);

break;

}

system("cls");

printf("THANK YOU %s FOR YOUR TIMELY PAYMENTS",s.name);

getch();

fclose(f);

}

Free Programming Source Codes and Computer Programming Tutorials

Monday, July 1, 2019

Math Calculator in PHP

Decimal To Roman Numeral Converter in Visual Basic 6

Telephone Billing System in C

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