600.107 Intro to Programming in Java		PRACTICE TEST 1


Classify each of the following as hardware or software (circle choice):

hard	soft	1) appletviewer 
hard	soft	2) Windows98
hard	soft	3) printer
hard	soft	4) operating system
hard	soft	5) my_program.java
hard	soft	6) CPU


True/False - circle your choice

true	false	9) Data stored in a memory location overwrites and destroys
			any data previously stored there.

true	false	10) A bit can have the value 0 or 1 only.

true	false	11) The compiler requires that each statement in a Java
			program appears on its own line.

true	false	12) Compiler errors result from mistakes in figuring out how
			to solve a problem.

true	false	13) The java command in JDK interprets and runs Java bytecode.

true	false	14) Java is interpreted, but not compiled.

true	false	15) Java bytecode is machine/system independent and therefore
			universal.

true	false	16) Square brackets [] are used to group multiple Java statements
			into one block.


17) What three words must be used at the start of every 'main' method
definition?


18) Classify each of the following as either valid or invalid identifiers:

valid		invalid		hep_cat
valid		invalid		a
valid		invalid		Dr. H
valid		invalid		book-mark
valid		invalid		class
valid		invalid		21st_century
valid		invalid		funny$


19) What are two different ways in which we use identifiers in a Java program?




21) What is the exact output of each of the following code segments? 
Write the word "nothing" if no output is created.  
Assume the following variables have been declared:

	
	int 	n1, n2;
	double	d1, d2;

// start
n1 = 17;
n2 = n1/5;
d1 = n1/4;
d2 = n1/2.0;
n1 = 22 % 5;
System.out.println(n1 + " " + n2 + " " + d1 + " " + d2);
// stop






// start
n1 = 3 - 14 / 2 % 5 + -3;
System.out.println(n1);
// stop






// start
d1 = 3 * 5 - 1.5 * 5 / 3;
System.out.println(d1);
// stop







// start
n1 = 3;
n2 = 8;
if (n1 <= n2)
	System.out.print(n1 + " ");
System.out.print(n2 + " ");
System.out.println("end");
// stop








// start
d1 = 13.4;
d2 = 9.801;
if (d1 == d2)
	System.out.println("equal");
else if (d1 > d2)
	System.out.println("greater");
else { System.out.println("less");
System.out.println("end");}
// stop











// start
n1 = 16;
d1 = 3.2;
n2 = 0;
while (d1 < n1) {
	n2 = n2 + 1;
	d1 = d1 + 5;
	}
System.out.println(n2 + " " + d1);
// stop











// start
if ( 23 <= 5)
	if (4 >= 2)
		System.out.println("middle");
else System.out.println("not");
System.out.println("end");
// stop











// start
if ( 3 <= 15)
	if (4 >= 2)
		System.out.println("happy");
	else System.out.println("sad");
System.out.println("end");
// stop






// start
if ( 13 <= 5)
	if (4 <= 2)
		System.out.println("tiny");
else { System.out.println("huge");
System.out.println("end"); }
// stop






// start
if ( 13 <= 5)  {
	if (4 <= 2)
		System.out.println("tiny");
else  System.out.println("huge");
System.out.println("end"); }
// stop






// start
n1 = 3;
while (n1 < 8) {
	if (n1 % 2 == 0) System.out.println(n1);
	n1 = n1 + 3;
	if (n1 % 3 == 0) System.out.println(n1);
	n2 = n1;
	while (n2 < 6) {
		System.out.println(n2);
		n2 = n2 + 1;
		}
	}
// stop





// start
n2 = 0;
for (n1 = 24; n1 <= 30; n1 = n1 + 2)
	n2 = n2 + n1;
System.out.println(n2);
// stop







// start
char ch;
String s1 = new String("this is it");
n1 = 0;
n2 = 0;
do {
	if (s1.charAt(n1) == 'i')
		n2 = n2 + 1;
	n1 = n1 + 2;
} while (n1 < s1.length());
System.out.println(n2);
// stop






// start
int num = 6;
while (num < 16) {
	switch (num % 4) {
	case 1: System.out.println("one"); break;
	case 2: System.out.println("two"); 
	case 3: System.out.println("three"); break;
	case 0: System.out.println("multiple");
	}
	num += 3;
}
// stop





22)     Write a program to read exactly 5 integers from the user and output their
	average.  You must use standard input and output.  Assume the values
	are all on one line of input.  Be sure to inlude any necessary
	Java libraries.


23) 	Write a sequence of statements that will read the first line of a
	plain text file named "input.txt" and write it to a text file called
	"output.txt".