C++/Simple Math
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[edit] Simple C++ Math
Math in C++ is very simple. Keep in mind that C++ follows the order of operations.
[edit] Adding, Subtracting, Multiplying and Dividing
#include <iostream>
using namespace std;
int main()
{
int myInt = 100;
myInt = myInt / 10; //myInt is now 10
myInt = myInt * 10; //myInt is back to 100
myInt = myInt + 50; //myInt is up to 150
myInt = myInt - 50; //myInt is back to where it started
cout << myInt << endl;
cin.get();
}
//C++ arithmetic operators
// + (add)
// - (subtract)
// / (divide)
// * (multiply)
// % (modulus division) 4 % 5 = 4 the remainder is returned 6 % 5 = 1
// += (add and assign)
// -= (subtract and assign)
// /= (divide and assign)
// *= (multiply and assign)
// %= (mod and assign)
[edit] C++ math library
The C++ math library is easy to use and is accessed by including cmath.
#include <cmath>
[edit] Square Root
Now that we have the C++ math library let's use some neat functions.
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
float myFloat = 0.0f; //the f (requires decimal) tells the compiler to treat this real number as a 32 bit float
//and not as a 64 bit double. this is more of a force of habit than a requirement
cout << "Enter a number. ENTER: ";
cin >> myFloat;
cout << "The square root of " << myFloat << " is " << sqrt(myFloat) << endl;
cin.clear();
cin.sync();
cin.get();
return 0;
}
[edit] Where To Go Next
| Topics in C++ | ||
| Beginners | Data Structures | Advanced |
|---|---|---|
| Part of the School of Computer Science | ||
