Examples in c++ and java and keypoints to remember

1. Some Examples And Things To Remember
C++ And Java

2. Programe to interchange the
values of two variables
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 int num,num1,replace;

 cout<<"entre number 1"<<endl;
 cin>>num;
 cout<<"entre number 2"<<endl;
 cin>>num1;
 replace=num;
 num=num1;
 num1=replace;
 cout<<"after replacing
"<<endl<<num<<endl;
 cout<<"after replacing "<<endl<<num1;
 }
 public static void main(String[] args) {
 int num,num1,replace;
 Scanner a=new Scanner(System.in);
 System.out.println("entre number 1");
 num=a.nextInt();
 System.out.println("entre number 2");
 num1=a.nextInt();
 replace=num;
 num=num1;
 num1=replace;
 System.out.println("after replacing
"+num);
 System.out.println("after replacing
"+num1);



 }


3. Programe to find absolute of a
negative number(Without if else)
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 int num,num1,replace;

 cout<<"entre negative number
"<<endl;
 cin>>num;
 int abs=num*-1;

 cout<<"abs value is
"<<endl<<abs<<endl;

 }
 public static void main(String[] args) {
 int num;
 Scanner a=new
Scanner(System.in);
 System.out.println("entre
negative number");
 num=a.nextInt();
 int abs=num*-1;
 System.out.println("absolute
value is "+abs);




 }

4. User entered 3 digit number break
it in single digits and display
accordingly
In c++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 int num,bre,bre1,bre2,b,c;

 cout<<"entre 3 digit number "<<endl;
 cin>>num;
 bre=num/100;
 c=num/10;
 bre1=c%10;
 bre2=num%10;

 cout<<"first digit is "<<endl<<bre<<endl;
 cout<<"Second digit is "<<endl<<bre1<<endl;
 cout<<"third digit is "<<endl<<bre2<<endl;

 }
 public static void main(String[] args) {
 // TODO code application logic here
 int number,bre,bre1,bre2,b,c;
 Scanner a =new Scanner(System.in);
 System.out.println("entre 3 digit
number");
 number=a.nextInt();
 bre=number/100;
 c=number/10;
 bre1=c%10;
 bre2=number%10;
 System.out.println("first digit is "+bre);
 System.out.println("second digit is
"+bre1);
 System.out.println("third digit is
"+bre2);

 }

5. Difference between / and %
Division / Modulus %
 4/2 will give 2
 10/5 will give 2
 15/3 will give 3
 21/2 will give 10
 4%2 will give 0
 10%2 will give 0
 15/3 will give 0
 21/2 will give 5
 Help full tool used to break
the number in single digits

6. Marks entered by user find average
of these marks
In c++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 int num,num1,num2;

 cout<<"entre marks of sub1 "<<endl;
 cin>>num;
 cout<<"entre marks of sub2 "<<endl;
 cin>>num1;
 cout<<"entre marks of sub3 "<<endl;
 cin>>num2;
 int avg=(num+num1+num2)/3;

 cout<<"avg is "<<endl<<avg<<endl;


 }
 public class JavaApplication10 {
 /**
 * @param args the command line arguments
 */
 public static void main(String[] args) {
 // TODO code application logic here
 int number,number1,number2;
 Scanner a =new Scanner(System.in);
 System.out.println("entre marks of sub 1");
 number=a.nextInt();
 System.out.println("entre marks of sub 2");
 number1=a.nextInt();
 System.out.println("entre marks of sub 3");
 number2=a.nextInt();
 int avg=(number+number1+number2)/3;

 System.out.println("avarage is "+avg);

 }

 }

7. Temperature in fahrenheit is input
convert it into celsius
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 float far,cel;

 cout<<"entre temperature in farenhet
"<<endl;
 cin>>far;

 cel=(far-32)*5/9;

 cout<<"temp in celseius is
"<<endl<<cel<<endl;


 }
 */
 public class JavaApplication10 {
 /**
 * @param args the command line arguments
 */
 public static void main(String[] args) {
 // TODO code application logic here
 double far,cel;
 Scanner a =new Scanner(System.in);
 System.out.println("entre temparature in
farenheit ");
 far=a.nextDouble();
 cel=(far-32)*5/9;
 System.out.println("Temp in cel is "+cel+"degree
celcius");

 }

 }

8. Ayaz basic salary is input through the keyboard. His dearness
allowance is 40% of basic salary, and house rent allowance is 20%
of basic salary. Write a program to calculate his gross salary.
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 float bsal,da,hr,gsal;

 cout<<"entre basic salary "<<endl;
 cin>>bsal;
 da=0.4*bsal;
 hr=0.2*bsal;
 gsal=bsal-da-hr;
 cout<<"Gross salar is
"<<endl<<gsal<<endl;


 }
 public class JavaApplication10 {
 /**
 * @param args the command line arguments
 */
 public static void main(String[] args) {
 // TODO code application logic here
 double bsal,da,hr,gsal;
 Scanner a =new Scanner(System.in);
 System.out.println("Ayaz entre your basic
salary ");
 bsal=a.nextInt();
 da=0.4*bsal;
 hr=0.2*bsal;
 gsal=bsal-da-hr;
 System.out.println("gross salary is"+gsal);

 }

 }

9. If a three-digit number is input through the keyboard, write a program to print
a new number by adding one to each of its digits. For example if the number
that is input is 123 then the output should be displayed as 234.
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 int number,bre,bre1,bre2,b,c,nbre,nbre1,nbre2;
 cout<<"entre number"<<endl;
 cin>>number;
 bre=number/100;
 nbre=bre+1;
 c=number/10;
 bre1=c%10;
 nbre1=bre1+1;
 bre2=number%10;
 nbre2=bre2+1;
 cout<<"after adding 1 is"<<endl;
 cout<<nbre;
 cout<<nbre1;
 cout<<nbre2;

 }
 int
number,bre,bre1,bre2,b,c,nbre,nbre1,nbre2;
 Scanner a =new Scanner(System.in);
 number=a.nextInt();
 bre=number/100;
 nbre=bre+1;
 c=number/10;
 bre1=c%10;
 nbre1=bre1+1;
 bre2=number%10;
 nbre2=bre2+1;
 System.out.println("after adding 1 is");
 System.out.print(nbre);
 System.out.print(nbre1);
 System.out.print(nbre2);

10. Radius is input from user find area
In C++ In Java
 #include<iostream>
 using namespace std;
 int main()
 {
 float radius,area;
 cout<<"entre radius"<<endl;
 cin>>radius;
 area=3.14*radius*radius;
 cout<<"radius is"<<endl;
 cout<<area;


 }
 public class JavaApplication10 {
 /**
 * @param args the command line arguments
 */
 public static void main(String[] args) {
 // TODO code application logic here
 double radius,area;
 Scanner a =new Scanner(System.in);
 System.out.println("entre radius");
 radius=a.nextDouble();
 area=3.14*radius*radius;
 System.out.println("area is"+area);


 }

 }

11. Key points
In C++ In Java
 In order to give one line gap we
use endl
 In C++ endl will give the one
line gap and cursor will go to
next line
 cout<<"entre radius"<<endl;
 In above instruction entre ra
dius will print and <<endl will
provide the one line gap
 Join string with variable we use
string << variablename;
 In order to give one line gap
we use System.out.println
 Here ln will give one line
break if we use
System.out.print it do not
give one line break and print
in the same line
 If we want to join string with
variable value we use + sign

12. Thanks alot
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