Day 三: Functions

Day 3: Functions

Why define your own functions?

ReadabilityMaintainabilityCode reuse

#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;}

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Function delaration should be be set before function invocation.

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Returning a value

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Up to one value may be returnedMust be the same type as the return typeNo need to be at the endReturns the value as soon as a return statement is executedFucntion overloading

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.
RecursionFunctions can call themselvesbase caserecursive stepPass by value(a) vs pass by reference(&a)

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