Understanding it better?

[Gregrs]

Is there a better way to understand how to write the code in C#? I've been using visual academy from the microsoft site, and for the first few lessons, I've understood it completely. Then I got to arrays, and the for statement (int i = 0; i < 10; i++), but I have no idea what they mean, or even how to use them in a program. What do they do? What are they for?

[prolemur]

An array is just a bunch of variables stored in memory beside each other. They are accessed by giving the index of the array you want.

 

example: To get the 4 element of the array b you write b[3], since arrays starts indexing at 0

 

A for loop is used when you want to iterate over a list or something that you know how many times you want to loop.

Perfect for using with arrays.

 

example: int i will be the index variable, so we know where we are in the array, the second statement in the for loop is the the condition that has to be met for the block to be run and the final statement is what to do after each iteration. This code will print the index and value of all elements in the array b.

for(int i = 0; i < b.length; i++) {     print(i + " " + b[i]);}

Let me know if you have any questions

[kittywantsbacon]

Java beginner here(correct me if I'm wrong), not C++ but I think I can explain as they're both Object Orientated and the fundamentals are essentially the same. An array is a better way to group your variables into a tidier thing(not the most technical word, whatever), think of creating an excel file spreadsheet for data instead of making a separate file for each entry. The for statement is declaring a variable that it uses as a counter in it's first section separated by semicolons. So int i = 0 is saying that the integer type variable "i" is equal to 0. Then it's checking in the second section to see if it should run; the check should probably return a boolean(I think). So i < 10 is checking to see if the integer type variable"i" is smaller than 10, if it is it runs the last section, i++ which means add 1 to "i". the for loop will repeat until "i" no longer is smaller than 10.

[EnVy_28]

Is there a better way to understand how to write the code in C#? I've been using visual academy from the microsoft site, and for the first few lessons, I've understood it completely. Then I got to arrays, and the for statement (int i = 0; i < 10; i++), but I have no idea what they mean, or even how to use them in a program. What do they do? What are they for?

Dude if you can afford, just go to Lynda.com

 

Freakin' worth it...

[prolemur]

Java beginner here(correct me if I'm wrong), not C++ but I think I can explain as they're both Object Orientated and the fundamentals are essentially the same. An array is a better way to group your variables into a tidier thing(not the most technical word, whatever), think of creating an excel file spreadsheet for data instead of making a separate file for each entry. The for statement is declaring a variable that it uses as a counter in it's first section separated by semicolons. So int i = 0 is saying that the integer type variable "i" is equal to 0. Then it's checking in the second section to see if it should run; the check should probably return a boolean(I think). So i < 10 is checking to see if the integer type variable"i" is smaller than 10, if it is it runs the last section, i++ which means add 1 to "i". the for loop will repeat until "i" no longer is smaller than 10.

Arrays in Java are actually objects with properties like length but in C/C++ they are essentially just a pointer to an address in memory. And to get the length of this array you need to either calculate sizeof(array) or outside of the scope of the array, the length must be passed to another function, for example.

[kittywantsbacon]

Arrays in Java are actually objects with properties like length but in C/C++ they are essentially just a pointer to an address in memory. And to get the length of this array you need to either calculate sizeof(array) or outside of the scope of the array, the length must be passed to another function, for example.

Ah I see