Miscellany

 Write a method that creates and initializes a two-dimensional array of double. The size of the array is determined by the arguments of the method, and the initialization values are a range determined by beginning and ending values that are also arguments of the method. Create a second method that will print the array generated by the first method. In main( ) test the methods by creating and printing several different sizes of arrays.

My Code:

import java.util.*;

class ArrayClass{

//creates a static 2-dimensional array of double
static double[][] banana;

void initAr(int f1, int f2, double upper, double lower){

//initializes the array to values f1 and f2
	banana = new double[f1][f2];

//creates values to use in the loops
	int i, j;
	double before,after;

//first iteration goes through one dimension of the array
	for(i=0;i<f1;i++){

//second iteration goes through 2nd dimension of the array
		for(j=0;j<f2;j++){

//gives before a random integer value
			before = new int[rand.nextInt((int) upper))];
//gives after a random integer value
			after = new int(rand.nextInt(99));
//makes after a value between 0.01 and 0.99
			after = (after/100);
//puts the new after value after the decimal place of before
			before = before + after;

//if the new value is smaller than the minimum value, set before to
//equal the minimum value.
			if(before < lower){
				before = lower;
			}

//sets the element of the array to value before.
			banana[i][j] = before;
		}
	}
	
}

//prints the array. 'nuff said.
void printAr(){
	int i,j;
	System.out.println("And here is the Matrix Printed:");
	for(i=0;i<banana.length;i++){
		for(j=0;j<banana[i].length;j++){
			System.out.print(banana.[i][j] + " ")}
		System.out.println();
	}
	System.out.println("And .... Done!");
}
 
}

public class Prob19{

//creates a new object of type ArrayClass and tests the methods in the class with 
//values of int: 4, 5 and doubles 100.00 and 50.00
public static void main(String[] args){
	ArrayClass test = new ArrayClass();
	test.initAr(4,5,100.00,50.00);
	test.printAr();
}

}



//end of java code

output from "javac Prob19.java"


[cripps@localhost Chapter 4]$ javac Prob19.java
Prob19.java:12: ']' expected
                        before = new int[rand.nextInt((int) upper))];
                                                                  ^
Prob19.java:13: '[' expected
                        after = new int(rand.nextInt(99));
                                       ^
Prob19.java:13: illegal start of expression
                        after = new int(rand.nextInt(99));
                                                         ^
Prob19.java:30: <identifier> expected
                        System.out.print(banana.[i][j] + " ")}
                                                ^
Prob19.java:30: ')' expected
                        System.out.print(banana.[i][j] + " ")}
                                                             ^
5 errors