Question

java: 1d arrays

PLEASE NEED HELp THANK YOU!!!

One dimensional (1D) array

1. Create an array of 1000 integers. Name the array: x

2. Assign 95 to the ninth element, 25 to the twentieth element of array x.

3. Assign the sum of the ninth and the twentieth element to the sixtieth element of array x.

4. Display the sixtieth element of the array.

5. Use the for statement to generate all indexes to read and display all elements in array x.

6. Use the while statement to generate all indexes to read and display all elements in array x.

7. Create an application that stores the ages of all students in a class: 20 , 21 , 16 , 18 , 19 , 19 , 18 , 20 ,

19 , 18 , 19 , 18 , 19 , 21 , 22 , 26 , 31 , 35 , 22 , 26 , 17 , 17 , 19 , 18 , 16 , 19 , 18 , 14 , 26 , 31 , 21 , 20 ,

20 , 20 , 16 , 15 , 18 , 19 , 20 in an array. Name the array: age

8. Display the ages that are greater than 20. Use for or while structure to generate all indexes to read all elements in array age. Use if

structure to select the elements that are greater than 20.

9. Display the number of students who are younger than 18. Use for or while structure to generate all indexes to read all elements in array age. Use if structure to select the elements that are less than 20.

10. Display the average age. Use for or while structure to generate all indexes to read all elements in array age.

Answer 1

1. Create an array of 1000 integers. Name the array: x

int x[]=new int[1000];

_____________

2. Assign 95 to the ninth element, 25 to the twentieth element of array x.

x[8]=95;

x[19]=25;

______________

3. Assign the sum of the ninth and the twentieth element to the sixtieth element of array x.

x[59]=x[8]+x[19];

______________

4. Display the sixtieth element of the array.

System.out.println("Sixtieth element of the array :"+x[59]);

______________

5. Use the for statement to generate all indexes to read and display all elements in array x.

for(int i=0;i<x.length;i++)

{

System.out.println(x[i]);

}

_______________

6. Use the while statement to generate all indexes to read and display all elements in array x

int i=0;

while(i<x.length)

{

System.out.println(x[i]);

}

________________

7. Create an application that stores the ages of all students in a class: 20 , 21 , 16 , 18 , 19 , 19 , 18 , 20 ,

19 , 18 , 19 , 18 , 19 , 21 , 22 , 26 , 31 , 35 , 22 , 26 , 17 , 17 , 19 , 18 , 16 , 19 , 18 , 14 , 26 , 31 , 21 , 20 ,

20 , 20 , 16 , 15 , 18 , 19 , 20 in an array. Name the array: age

Ans)

int age[]={20 , 21 , 16 , 18 , 19 , 19 , 18 , 20 ,19 , 18 , 19 , 18 , 19 , 21 , 22 , 26 , 31 , 35 , 22 , 26 , 17 , 17 , 19 , 18 , 16 , 19 , 18 , 14 , 26 , 31 , 21 , 20 ,20 , 20 , 16 , 15 , 18 , 19 , 20};

_________________

8. Display the ages that are greater than 20. Use for or while structure to generate all indexes to read all elements in array age. Use if

structure to select the elements that are greater than 20.

int i=0;

while(i<x.length)

{

if(age[i]>20)

{

System.out.println(age[i]);

}

}

___________________

9. Display the number of students who are younger than 18. Use for or while structure to generate all indexes to read all elements in array age. Use if structure to select the elements that are less than 20.

int count=0;

for(int i=0;i<x.length;i++)

{

if(age[i]<18)

{

count++;

}

}

System.out.println("No of students whose age is less than 18 are :"+count);

_______________

10. Display the average age. Use for or while structure to generate all indexes to read all elements in array age.

double sum=0;

for(int i=0;i<x.length;i++)

{

sum+=x[i];

}

System.out.println("Average age :"+(sum/x.length));

_____________Thank You