String to Int function (C++)

This little piece of code can convert a string of decimal characters into an integer value.  If you seek to convert a string into a double, see this post.

A Pretend Radio Class (C++)

Download the  entire code: RadioClass.zip

A Calculator Program Made in Visual Basic

This simple calculator is a great example for beginners to examine to understand the basics of Visual Basic.  I must warn you that this isn’t perfect, but perfecting it would be an excellent exercise for a novice Visual Basic programmer.

A Calculator Written in Visual Basic

–           Download: VBcalc.zip

– This download is a Microsoft Visual Studio Solution file, Visual studio is required to open it.  A free edition of the Visual studio is available from Microsoft at http://www.microsoft.com/express/Downloads/

Doubly linked Stack Class (C++)

Definition file, stack.h

Implementation file, stack.cpp

Test driver

Greatest Common Divisor (Euclidean Algorithm C++)

This piece of code can determine the GCD of two numbers by applying the euclidean algorithm recursively.

Reverse an Integer Recursively (C++)

A linked list Class (C++)

Class Definition:

Implementation of the class:

And a Test Driver:

A C++ Menu

String to float function (C++)

/*
* A function to convert a string into a float
* Author: Danny Battison
* Contact: gabehabe@hotmail.com
*/

#include

float StringToFloat (std::string str)
{
float total = 0; // the total to return
int length = str.length(); // the length of the string
int prefixLength=0; // the length of the number BEFORE the decimal
int suffixLength=0; // the length of the number AFTER the decimal
bool decimalFound = false; // use this to decide whether to increment prefix or suffix
for (unsigned int i = 0; i < str.length(); i++) { // loop through the string if (str[i] == '.') { // if we found the '.' then we are now counting how long the decimal place is length --; // subtract one from the length (. isn't an integer!) decimalFound = true; // we found the decimal! HAZAA! } else if (!decimalFound) prefixLength++;// if the decimal still hasn't been found, we should count the main number else if (decimalFound) // otherwise, we should count how long the decimal is! suffixLength++; } int x = 1; // our multiplier, used for thousands, hundreds, tens, units, etc for (int i = 1; i < prefixLength; i++) x *= 10; for (int i = 0; i < prefixLength; i++) { // get the integer value // 48 is the base value (ASCII) // multiply it by x for tens, units, etc total += (static_cast (str[i]) – 48) * x;
x /= 10; // divide to decide which is the next unit
}
float decimal=0; // our value of the decimal only (we’ll add it to total later)
x = 1; // again, but this time we’ll go the other way to make it all below 0
for (int i = 1; i < suffixLength; i++) x *= 10; for (int i = 0; i < suffixLength; i++) { // same again, but this time it's for the decimal value decimal += (static_cast (str[i+suffixLength+1]) – 48) * x;
x /= 10;
}

for (int i = 0; i < suffixLength; i++) decimal /= 10; // make the decimal so that it is 0.whatever total += decimal; // add them together return total; } /** EXAMPLE USAGE **/ #include
int main ()
{
std::string str = “123.456”;
float f = StringToFloat(str) + 0.2f; // to get 123.656
std::cout << f; std::cin.get (); return EXIT_SUCCESS; }