Why define your own functions?
Readability
Maintainability
Code reuse
Cpp代碼
#include <iostream>
using namespace std;
int raiseToPower(int base, int exponent) {
int result = 1;
for (int i = 0; i < exponent; i = i + 1) {
result = result * base;
}
return result;
}
int main() {
int threeExpFour = raiseToPower(3, 4);
cout << "3^4 is " << threeExpFour << endl;
return 0;
}
Function delaration should be be set before function invocation.
Returning a value
Up to one value may be returned
Must be the same type as the return type
No need to be at the end
Returns the value as soon as a return statement is executed
Fucntion overloading
Cpp代碼
void printOnNewLine(int x)
{
cout << "1 Integer: " << x << endl;
}
void printOnNewLine(int x, int y)
{
cout << "2 Integers: " << x << " and " << y << endl;
}
Function prototypes are generally put into separate header files.
Recursion
Functions can call themselves
base case
recursive step
Pass by value(a) vs pass by reference(&a)
