C++ September 25, 2006
Posted by metalsam in General, c / c++.4 comments
I’ve been tinkering in C++ again. I was stuck for ideas on something to program, so G set me the task of writing a program that would swap two variables. Not too tricky, but it took me a while to get the logic right. Here it is :
// c++ that asks for two variables and then swaps them around
#include <iostream>
using namespace std;
//function to define two variables via user input
int x;
int y;
void variabledefine ()
{
cout << “Please define integer variables X and Y” << endl;
cout << “Define X: ” << endl;
cin >> x;
cout << “Define Y: ” << endl;
cin >> y;
cout << “You have defined X as: ” << x << endl << “and Y as: ” << y << endl;
}
// Now an attempt to switch the variables.
//
int variableswitch (int a, int b)
{
cout << “This function will attempt to switch the values of variables X and Y.” << endl;
a = x;
b = y;
x = b;
y = a;
}
int main ()
{
variabledefine ();
x, y = variableswitch (x, y);
cout << “X is now: ” << x << endl;
cout << “Y is now: ” << y << endl;
return 0;
}
Woop woop !
c programming April 9, 2006
Posted by metalsam in Linux, c / c++.5 comments
So I started to learn c. C is evil, very very evil. But im still earning it anyway, figured I should try and make some maths programs to feed my university homework into =)
With some help from Gerald I made a program that multiplied two numbers together, and then using that, and some stuff off the net, I made one that asks you for two numbers, and then multiplies them together =)
This is it:
/* Sams 1337 number timesing program */
/* Take asks user fpr two numbers and multiplies them together */
#include <stdio.h>
int main()
{
/* Asks user for a number */
printf("\n enter an integre number….\n");
/* Defines variables – the two inputs and the output */
float number1;
float number2;
int answer;
/* Prompts user to input a number */
scanf("%f", &number1);
/* Asks user for a second number */
printf("\n and another one….\n");
/* Prompts user for as econd number */
scanf("%f", &number2);
/* Tells user what is happening to the numbers */
printf("\n the two are multiplied together….\n");
/* Multiplies the two numbers together */
answer = number1 * number2;
/* Prints the answer */
printf("%4d\n", answer);
/* Tells system everything is ok */
return 0;
}
Notes:
- /* */ contains comments for someone going through the code. Isnt actually used when compiled.
- after every argument ( i think this is the correct term, ie every variable, sum, etc ) you must have a ;
- # include <stdio> is the libbrary that tells the computer how to interpret scanf printf
- { } contains the function.
- This will only work for linux ( think :S)
- I still have a lot to learn !
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