I'm new to Flex programming.. and I need to do some iteration.
How do I perform loops in Flex?
And does Flex has "switch case"?
Thanks guys
For Loops in Flex implemented as follows:
var i:int;
for (i = 0; i < 5; i++)
{
trace(i);
}
You can also do for each loops as :
var myArray:Array = ["name1", "name2", "name3"];
for each (var item in myArray)
{
}
While Loops:
var i:int = 0;
while (i < 10)
{
i++;
}
also Yes Flex does support switch statements these can be implemented as follows
var someDate:Date = new Date();
var dayNum:uint = someDate.getDay();
switch(dayNum)
{
case 0:
trace("Sunday");
break;
case 1:
trace("Monday");
break;
case 2:
trace("Tuesday");
break;
case 3:
trace("Wednesday");
break;
case 4:
trace("Thursday");
break;
case 5:
trace("Friday");
break;
case 6:
trace("Saturday");
break;
default:
trace("Out of range");
break;
}
remember when writing this funcionality in flex it has to be contained within the script tags**
Related
Please forgive my noob-ness.
So, i figured out how to create two separate switch loops, in order to access two separate values. My trouble now, is that I don't know how to write a function that would allow me to concatenate the results of the two switch values.
var select = document.getElementById('weather');
var para = document.getElementById('alf');
var door = document.getElementById('dance');
var mort = document.getElementById('tim');
document.getElementById('weather').addEventListener('change',
setWeather);
document.getElementById('dance').addEventListener('change',
setDance);
function setWeather() {
var choice = this.value;
switch(choice) {
case 'sunny':
para.textContent = "fly me to the Moon";
break;
case 'rainy':
para.textContent = "let me sail amongst the stars";
break;
case 'snowy':
para.textContent = "life on Jupiter and Mars";
break;
default:
para.textContent = "";
}
}
function setDance() {
var art = this.value;
switch(art) {
case 'hail':
mort.textContent = "in other words";
break;
case 'rail':
mort.textContent = "darling kiss me";
break;
case 'cat':
mort.textContent = "please be true";
break;
default:
mort.textContent = "";
}
}
function result() {
weatherVal = weather.value;
danceVal = dance.value;
para.textContent = weatherVal + danceVal;
}
I tried to use the above code "function result()" to write the function to create the concatenation, but no success. I feel like the answer is right in front of me, but I'm just not quite sure what's going on.
You could make choice and art global variables and then use them in result like this:
var select = document.getElementById('weather');
var para = document.getElementById('alf');
var door = document.getElementById('dance');
var mort = document.getElementById('tim');
document.getElementById('weather').addEventListener('change', setWeather);
document.getElementById('dance').addEventListener('change', setDance);
var choice;
var art;
function setWeather() {
choice = this.value;
switch(choice) {
case 'sunny':
para.textContent = "fly me to the Moon";
break;
case 'rainy':
para.textContent = "let me sail amongst the stars";
break;
case 'snowy':
para.textContent = "life on Jupiter and Mars";
break;
default:
para.textContent = "";
break;
}
}
function setDance() {
art = this.value;
switch(art) {
case 'hail':
mort.textContent = "in other words";
break;
case 'rail':
mort.textContent = "darling kiss me";
break;
case 'cat':
mort.textContent = "please be true";
break;
default:
mort.textContent = "";
break;
}
}
function result() {
para.textContent = choice + art;
}
I have written a c code for switching between two different switch statements,
but I am looking for a more generic solution, meaning without using state variable and while loop, or jump from one switch statement to another switch statement.
I want some suggestion or key input from you.
Thank you and please excuse my poor English.
#include <stdio.h>
int main()
{
unsigned char state,state1;
enum
{
Add,Sub,Mul,Div,START,STOP
}Arith_Op;
enum
{
Add1,Sub1,Mul1,Div1,START1,STOP1
}Arith_Op1;
Arith_Op = Add;
Arith_Op1 = Add1;
state = START;
while (state != STOP)
{
switch(Arith_Op)
{
case Add :
printf("Add\n");
Arith_Op = Sub;
break;
case Sub :
printf("sub\n");
Arith_Op = Mul;
break;
case Mul :
printf("mul\n");
Arith_Op = Div;
break;
case Div :
printf("div\n");
Arith_Op = STOP;
break;
default :
printf("default\n");
state = STOP;
state1 = START1;
break;
}
}
printf(" state out of while and Switch case ");
while (state1 != STOP1)
{
switch(Arith_Op1)
{
case Add1 :
printf("Add1\n");
Arith_Op1 = Sub1;
break;
case Sub1 :
printf("sub1\n");
Arith_Op1 = Mul1;
break;
case Mul1 :
printf("mul1\n");
Arith_Op1 = Div;
break;
case Div1 :
printf("div1\n");
Arith_Op1 = STOP1;
break;
default :
printf("default1\n");
state1 = STOP1;
break;
}
}
printf(" state 1 out of while and Switch case ");
return 0;
}
I am supposed to count the /*...*/ comments in a file and I was wondering if this code is right or am I missing something out?
My Code
void commentsLongerThanOneLine(FILE* inputStream, FILE* outputStream) {
int count = 0, c, state = 1;
while ((c = fgetc(inputStream) != EOF)) {
switch (state) {
case 1: switch (c) {
case '/': state = 2; break;
}
break;
case 2: switch (c) {
case '/': state = 3; break;
case '*': state = 4; break;
default: state = 1;
}
break;
case 3: switch (c) {
case '\n': state = 1; break;
default: state = 4; count++;
}
break;
case 4:switch (c) {
case'*': if (c == '\n') count++; break;
default: state = 4; if (c == '\n') count++;
}
}
}
fprintf(outputStream, "Comments longer than one line: %d\n", count);
}
I've written a program that reads an account value from a text file and then assigns these values to a variable for each account. Once this is done, reading from the same text file, an action to be done to each account value is identified in the format "Account# Actiontype ActionModifier". All the correct values are being scanned and the proper values are being stored when I insert printfs to check, but immediately after the correct value is printed, the value is put through an else if loop. When doing this for some reason the value is being read as 1 no matter what and is executing the actions in the else if loop as if it were equal to 1.
loopState = 1;
while(loopState != 0)
{
for(i = 1;i < 100 ;i++)
{
if(i < 6)// This executes fine
{
fscanf(bankfile,"%f",&accValue);
switch(i)
{
case 1:
acc1 = accValue;
break;
case 2:
acc2 = accValue;
break;
case 3:
acc3 = accValue;
break;
case 4:
acc4 = accValue;
break;
case 5:
acc5 = accValue;
printf("Done module one\n");
break;
}
}
else // scan for the the first value, than the second, then the third
{
fscanf(bankfile,"%d",&accNum);
if(accNum != 0)
{
fscanf(bankfile,"%c",&accAction);
if(accAction == 'W' || accAction == 'D')
{
fscanf(bankfile,"%f",&actValue);
printf("%d %c %.2f\n",accNum,accAction,actValue);//this will be correct
printf("%d\n",accNum); //this will print say "2"
if(accNum = 1)//but this if statement will be run
{//thus printing the below printf
printf("If accNum = 1 this will print\n");
switch(accAction)
{
case 'W':
final1 = withdrawl(acc1,actValue);
break;
case 'D':
final1 = deposit(acc1,actValue);
break;
}
}
else if(accNum = 2)
{
switch(accAction)
{
case 'W':
final2 = withdrawl(acc2,actValue);
break;
case 'D':
final2 = deposit(acc2,actValue);
break;
}
}
else if(accNum = 3)
{
switch(accAction)
{
case 'W':
final3 = withdrawl(acc3,actValue);
break;
case 'D':
final3 = deposit(acc3,actValue);
break;
}
}
else if(accNum = 4)
{
switch(accAction)
{
case 'W':
final4 = withdrawl(acc4,actValue);
break;
case 'D':
final4 = deposit(acc4,actValue);
break;
}
}
else if(accNum = 5)
{
switch(accAction)
{
case 'W':
final5 = withdrawl(acc5,actValue);
break;
case 'D':
final5 = deposit(acc5,actValue);
break;
}
}
}
else if(accAction == 'B' || accAction == 'U')
{
printf("%d %c\n",accNum,accAction);//this will be correct
printf("%d\n",accNum);//this will print say "4"
if(accNum = 1)//but this if statement will be run
{//thus printing this printf below
printf("If accNum = 1 this will print\n");
switch(accAction)
{
case 'B':
final1 = balance(acc1);
break;
case 'U':
final1 = update(acc1);
break;
}
}
else if(accNum = 2)
{
switch(accAction)
{
case 'B':
final2 = balance(acc2);
break;
case 'U':
final2 = update(acc2);
break;
}
}
else if(accNum = 3)
{
switch(accAction)
{
case 'B':
final3 = balance(acc3);
break;
case 'U':
final3 = update(acc3);
break;
}
}
else if(accNum = 4)
{
switch(accAction)
{
case 'B':
final4 = balance(acc4);
break;
case 'U':
final4 = update(acc4);
break;
}
}
else if(accNum = 5)
{
switch(accAction)
{
case 'B':
final5 = withdrawl(acc5,actValue);
break;
case 'U':
final5 = deposit(acc5,actValue);
break;
}
}
}
}
else
loopState = 0;
}
}
}
printf("Exited Loop");
}
From my understanding I can't see where the value is being altered if just the line before it is being seen as the correct value
Your conditional statements are doing assignment.
else if (accNum = 3)
should be
else if (accNum == 3)
I am using SDL in C, and I'm trying to make a character move on the screen when a key is pressed, and stop when it is released, but it seems as if the KEYUP event is triggering when the key is still being held down. If I remove the KEYUP section in pressed(), the characters will slide across the screen, but obviously won't stop on their own. If I leave the KEYUP section in, I have to press the key repeatedly to move them across the screen.
Any idea what I'm doing wrong?
Here's what I have:
...
int done = 0;
while (done==0)
{
pressed();
if (kenter == 1)
{
state = 1;
subscreen();
}
if (kescape == 1)
{
done = 1;
}
if (kup == 1)
{
playery += -2;
}
if (kdown == 1)
{
playery += 2;
}
if (kright == 1)
{
playerx += 2;
}
if (kleft == 1)
{
playerx += - 2;
}
...
int pressed ()
{
SDL_Event keyevent;
while (SDL_PollEvent(&keyevent))
{
switch(keyevent.type)
{
case SDL_KEYDOWN:
switch(keyevent.key.keysym.sym)
{
case SDLK_RETURN:
{
kenter = 1;
break;
}
case SDLK_ESCAPE:
{
kescape = 1;
break;
}
case SDLK_a:
{
ka = 1;
break;
}
case SDLK_s:
{
ks = 1;
break;
}
case SDLK_UP:
{
kup = 1;
break;
}
case SDLK_DOWN:
{
kdown = 1;
break;
}
case SDLK_RIGHT:
{
kright = 1;
break;
}
case SDLK_LEFT:
{
kleft = 1;
break;
}
default:
break;
}
}
switch(keyevent.type)
{
case SDL_KEYUP:
switch(keyevent.key.keysym.sym)
{
case SDLK_RETURN:
{
kenter = 0;
break;
}
case SDLK_ESCAPE:
{
kescape = 0;
break;
}
case SDLK_a:
{
ka = 0;
break;
}
case SDLK_s:
{
ks = 0;
break;
}
case SDLK_UP:
{
kup = 0;
break;
}
case SDLK_DOWN:
{
kdown = 0;
break;
}
case SDLK_RIGHT:
{
kright = 0;
break;
}
case SDLK_LEFT:
{
kleft = 0;
break;
}
default:
break;
}
}
}
return 0;
}
I think your switch statements are broken.
Use this less confusing way
int pressed ()
{
SDL_Event event;
while(SDL_PollEvent(&event) )
{
if(event.type == SDLK_KEYDOWN)
{
switch(event.key.keysym.sym)
{
case SDLK_RETURN:
doStuff = 1
break;
default:
break;
}
}
if(event.type == SDLK_KEYUP)
{
switch(event.key.keysym.sym)
{
case SDLK_RETURN:
doStuff = 0;
break;
default:
break;
}
}
}
}
Also important:
SDL Tutorials: Practical Keyboard Input
Oh and avoid using global variables!
Your use of two switch statements is odd and confusing, you should probably fix that.
The issues you're seeing are likely due to keyboard repeat, see the SDL_EnableKeyRepeat() call for how to disable it.
don't use switch. I experienced same thing, but I resolved into using 'if' like this. Maybe switch has 'else if'.
if(event.type == SDL_KEYDOWN){
....
}
if(event.type == SDL_KEYUP){
....
}