1. © A+ Computer Science - www.apluscompsci.com
if-else if-else if
switch case
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2. © A+ Computer Science - www.apluscompsci.com
String letter = "C";
int ascii=0;
if(letter.equals("A")) {
ascii=65; }
else if(letter.equals("B")){
ascii=66;
else if(letter.equals("C")){
ascii=67;
else if(letter.equals("D")){
ascii=68;
else{
ascii=69;
out.println(ascii); if
else if
OUTPUT 67
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3. © A+ Computer Science - www.apluscompsci.com
open
ifelseif.java
Complete the code
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4. © A+ Computer Science - www.apluscompsci.comif
else if
int uilScore=200;
if(uilScore>220) {
out.println("state bound"); }
else if(uilScore>200) {
out.println("region bound");
else if(uilScore>180) {
out.println("district bound");
else{
out.println("take more tests");
OUTPUT district bound
Only one condition can be found true!
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5. © A+ Computer Science - www.apluscompsci.com
open
ifelseifuil.java
Complete the code
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6. © A+ Computer Science - www.apluscompsci.com
switch case
OUTPUT
num == 30
int num = 30;
switch (num) {
case 11 : out.println("num == 11"); break;
case 22 : out.println("num == 22"); break;
case 30 : out.println("num == 30"); break;
case 40 : out.println("num == 40"); break;
default : out.println("does not equal"); }
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7. What if there is no break?
If you have no break, every
statement after the first true
condition is executed until a
break is encountered or the
bottom of the switch case
is reached.
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8. © A+ Computer Science - www.apluscompsci.com
switch case
OUTPUT
num == 30 num == 40 does not equal
int num = 30;
switch (num) {
case 11 : out.println("num == 11");
case 22 : out.println("num == 22");
case 30 : out.println("num == 30");
case 40 : out.println("num == 40");
default : out.println("does not equal"); }
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9. © A+ Computer Science - www.apluscompsci.com
open
switchcaseone.java
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10. © A+ Computer Science - www.apluscompsci.com
open
switchcasetwo.java
switchcasethree.java
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11. © A+ Computer Science - www.apluscompsci.com
logical
operators
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12. frequently used operators © A+ Computer Science - www.apluscompsci.com
Logical
frequently used operators
Operator
Use
x||y
either x or y must be true
x&&y
both x and y must be true !x
true if x is false – false if x is true
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13. © A+ Computer Science - www.apluscompsci.com
logical
operators
int height=6;
int weight=150;
if(height>6||weight>150) {
out.println("big un"); }
else if(height<=6&&weight<=150) {
out.println("little un");
OUTPUT little un
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14. © A+ Computer Science - www.apluscompsci.com
open
logical.java
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15. © A+ Computer Science - www.apluscompsci.com
nested ifs
int num =75;
if(num>50) {
if(num>50&&num<100)
if(num>50&&num<150)
System.out.println(">50 && <150"); }
OUTPUT
>50 && <150
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16. © A+ Computer Science - www.apluscompsci.com
open
nestedifs.java
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17. © A+ Computer Science - www.apluscompsci.com
Dangling Else
int num=15;
if(num>10){
if(num<25)
out.println("jump");
}else
out.println("run");
OUTPUT
jump
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18. © A+ Computer Science - www.apluscompsci.com
Dangling Else
int num=35;
if(num>10)
if(num<25)
out.println("jump");
else
out.println("run");
OUTPUT
run
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19. © A+ Computer Science - www.apluscompsci.com
open
danglingelse.java
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20. © A+ Computer Science - www.apluscompsci.com
Start work
on the labs
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