TonnyXu

// UIApplication.h		
UIApplicationDidEnterBackgroundNotification       __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);
UIApplicationWillEnterForegroundNotification      __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0);
UIApplicationDidFinishLaunchingNotification;
UIApplicationDidBecomeActiveNotification;
UIApplicationWillResignActiveNotification;
UIApplicationDidReceiveMemoryWarningNotification;
UIApplicationWillTerminateNotification;
UIApplicationSignificantTimeChangeNotification;
UIApplicationWillChangeStatusBarOrientationNotification; // userInfo contains NSNumber with new orientation

TonnyXu

#include <iostream>

int main (int argc, char * const argv[]) {
    int i = 6;
    std::cout << i++ << std::endl;
    int j = i++;
    std::cout << j << std::endl;
    
    int p = 7;
    std::cout << ++p << std::endl;

TonnyXu

#include <iostream>

int main (int argc, char * const argv[]) {
    int i = 1;
    int j = i << 4;
    std::cout << j << std::endl;
    
    return 0;
}

TonnyXu

#include <iostream>

int main (int argc, char * const argv[]) {
    int i = 5;
    int *p = &i;
    ++*p;
    std::cout << i << std::endl;
    
    return 0;
}

TonnyXu

#include <iostream>

int main (int argc, char * const argv[]) {
    int a[] = {3,2,1,0};
    int *pa = a;
    std::cout << pa++ << std::endl;

    return 0;
}

TonnyXu

public class Stack { 
    private Object[] elements; 
    private int size = 0; 

    public Stack(int initialCapacity) { 
        this.elements = new Object[initialCapacity]; 
    }

    public void push(Object e) { 
        ensureCapacity(); 

TonnyXu

#define myIndexPath [NSIndexPath indexPathForRow:2 inSection:1]

NSAssert(myIndexPath == [NSIndexPath indexPathForRow:2 inSection:1], @"they should be the same object");

// omitted code from UITableView -cellForRowAtIndexPath:
if (myIndexPath == systemIndexPath){
  // my cell, show my contents
}

TonnyXu

wc -l `find . -type f \( -name "*.h" -or -name "*.m" \)`

TonnyXu

find . -type f \( -name '*.xib' -or -name "*.h" -or -name "*.m" \) -exec awk '{print NR}' {} +|tail -1

TonnyXu

# NOTE: all the color mark must be surrounded with \[\] to avoid a wrong line wrapping calculation.
export PS1="\[\e[35;40m\]\u\[\e[0m\]@\[\e[36;40m\]\h\[\e[0m\]:\[\e[37;40m\]\W\[\e[0m\] \t \[\e[36;40m\](\j) <\!>\[\e[0m\]\n\[\e[35;40m\]\$\[\e[0m\] "