const+放置位置的意義

有放在不同位置的講解和example

1. (error) unresolved symbols

Apply new function in gpio.c to main.c

在轉換人臉辨識專題用程式時, 為了要加入File copy的code, 

要把GCC compiler  改用G++ 來build (openCV 等都會用到C++功能)

Opengate 大大

http://mropengate.blogspot.tw/2017/08/cc-c.html

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Problem 665: Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element.

We define an array is non-decreasing if array[i] <= array[i + 1] holds for every i (1 <= i < n).

Function pointers in C

Let's start with a basic function which we will be pointing to:

int addInt(int n, int m) {
    return n+m;
}

First thing, let's define a pointer to a function which receives 2 ints and returns an int: