On February 19, 2015 in Computer Science Engineering my teacher taught the class about Arrays. An Array is essentially a list of data which will contain a certain length of variables. Since the first element in an array is [0] if you want an Array that contains a length of 10 the array should read array[9]. Below is the notes my class took on Arrays.
// arrays!!!
// declare an integer array
// datatype[] name;
int[] array;
// create the array
// name = new datatype[size];
array = new int[10];
// or you can declare and create
int[] array2 = new int[10];
// assign random ints to array
// this loop starts at 0 and runs until we've reached array.length (100)
for(int i = 0; i < array.length; i++){
// since random() returns a float, we can
// cast it to an int
array[i] = (int)random(101);
}
// assign random ints to array
// this loop starts at 0 and runs until we've reached array.length (100)
for(int i = 0; i < array2.length; i++){
// since random() returns a float, we can
// cast it to an int
array2[i] = (int)random(101);
}
// let's check - print out the elements of array
println(array);
print(array);
print("\n"); // print new line
// "\t" <- tab
// "\"" <- "
// "\'" <- '
// "\\" <- \
// double each value stored in array and store it back into array
for(int i = 0; i < array.length; i++){
array[i] *= 2; // array[i] = array[i] * 2;
}
// print out the elements of array
for(int i = 0; i < array.length; i++){
println("[" + i + "] " + array[i]);
}
// count how many even numbers are in array2
int numEvens = 0;
for(int i = 0; i < array2.length; i++){
if(array2[i] % 2 == 0){
numEvens++;
}
}
println(array2);
println(numEvens);
// copy everything from array into array2
for(int i = 0; i < min(array.length, array2.length); i++){
array2[i] = array[i];
}
print(array + " " + array2 + "\n");
boolean isEqual = true;
// int numEqual = 0;
for(int i = 0; i < array.length; i++){
if(array[i] == array2[i]){
// numEqual++;
}
else{
isEqual = false;
}
}
println(array == array2);
// println(numEqual == array.length);
println(isEqual);
