Day 3: Functions

Why define your own functions?
Readability
Maintainability
Code reuse
Cpp代码  
#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代码  
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)

补充：软件开发 , C语言 ,

上一个：Day 2: Flow of control
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