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Java : Trying to print average temperature for each of 3 weeks using instantiable classes and arrays
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I need some help please. My task is to develop an application using instantiable classes and arrays to store temperature values of 3 weeks (7 days in a week) and calculate and display average for each week. I think I am close, but my code returns null as value for average, not sure what is wrong! This is the code:
Instantiable class:
public class Temperature {
private double tempData; //array to store temperature readings from 3 weeks
private double avgOfWeek; // array to store avg of each week;
public Temperature () {; // constructor to initialize instance variables with their default values, ie. tempData with null
}
// setter
// setter method to assign / store a 2D array of double elements in the instance variable tempData
public void setTemp (double tempData) {
this.tempData = tempData;
}
// processing
public void calcAvg () {
double avgOfWeek = new double [3];
double sum = new double [3];
int counter = 0;
for (int row=0; row < tempData.length; row ++) {
for (int col=0; col < tempData[row].length; col++) {
sum [row]= sum [row] + tempData [row][col];
}
avgOfWeek [row] = sum[row]/ tempData[row].length;
}
}
// getter method to retrieve the average
public double getAvg () {
return avgOfWeek;
}
}
Application:
public class TemperatureApp {
public static void main (String args) {
// declare a 2D array to store values of temperature
double temp = new double {
{1,2,3,4,5,6,7},
{7,6,5,4,3,2,1},
{1,2,3,4,3,2,1},
};
Temperature myTemp = new Temperature ();
myTemp.setTemp(temp);
myTemp.calcAvg();
double a = myTemp.getAvg();
System.out.println (" The average temperature is " + a);
}
}
java arrays
edited Jan 3 at 16:07
Sofo Gial
515619
asked Jan 3 at 15:08
MszaMsza
83
add a comment |
0
I need some help please. My task is to develop an application using instantiable classes and arrays to store temperature values of 3 weeks (7 days in a week) and calculate and display average for each week. I think I am close, but my code returns null as value for average, not sure what is wrong! This is the code:
Instantiable class:
public class Temperature {
private double tempData; //array to store temperature readings from 3 weeks
private double avgOfWeek; // array to store avg of each week;
public Temperature () {; // constructor to initialize instance variables with their default values, ie. tempData with null
}
// setter
// setter method to assign / store a 2D array of double elements in the instance variable tempData
public void setTemp (double tempData) {
this.tempData = tempData;
}
// processing
public void calcAvg () {
double avgOfWeek = new double [3];
double sum = new double [3];
int counter = 0;
for (int row=0; row < tempData.length; row ++) {
for (int col=0; col < tempData[row].length; col++) {
sum [row]= sum [row] + tempData [row][col];
}
avgOfWeek [row] = sum[row]/ tempData[row].length;
}
}
// getter method to retrieve the average
public double getAvg () {
return avgOfWeek;
}
}
Application:
public class TemperatureApp {
public static void main (String args) {
// declare a 2D array to store values of temperature
double temp = new double {
{1,2,3,4,5,6,7},
{7,6,5,4,3,2,1},
{1,2,3,4,3,2,1},
};
Temperature myTemp = new Temperature ();
myTemp.setTemp(temp);
myTemp.calcAvg();
double a = myTemp.getAvg();
System.out.println (" The average temperature is " + a);
}
}
java arrays
edited Jan 3 at 16:07
Sofo Gial
515619
asked Jan 3 at 15:08
MszaMsza
83
2
You have twoavgOfWeekvariables, remove the one declared in thecalcAvgmethod .
– Arnaud
Jan 3 at 15:11
1
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
thank you! thank really helped!
– Msza
Jan 3 at 18:47
add a comment |
0
0
0
I need some help please. My task is to develop an application using instantiable classes and arrays to store temperature values of 3 weeks (7 days in a week) and calculate and display average for each week. I think I am close, but my code returns null as value for average, not sure what is wrong! This is the code:
Instantiable class:
public class Temperature {
private double tempData; //array to store temperature readings from 3 weeks
private double avgOfWeek; // array to store avg of each week;
public Temperature () {; // constructor to initialize instance variables with their default values, ie. tempData with null
}
// setter
// setter method to assign / store a 2D array of double elements in the instance variable tempData
public void setTemp (double tempData) {
this.tempData = tempData;
}
// processing
public void calcAvg () {
double avgOfWeek = new double [3];
double sum = new double [3];
int counter = 0;
for (int row=0; row < tempData.length; row ++) {
for (int col=0; col < tempData[row].length; col++) {
sum [row]= sum [row] + tempData [row][col];
}
avgOfWeek [row] = sum[row]/ tempData[row].length;
}
}
// getter method to retrieve the average
public double getAvg () {
return avgOfWeek;
}
}
Application:
public class TemperatureApp {
public static void main (String args) {
// declare a 2D array to store values of temperature
double temp = new double {
{1,2,3,4,5,6,7},
{7,6,5,4,3,2,1},
{1,2,3,4,3,2,1},
};
Temperature myTemp = new Temperature ();
myTemp.setTemp(temp);
myTemp.calcAvg();
double a = myTemp.getAvg();
System.out.println (" The average temperature is " + a);
}
}
java arrays
edited Jan 3 at 16:07
Sofo Gial
515619
asked Jan 3 at 15:08
MszaMsza
83
I need some help please. My task is to develop an application using instantiable classes and arrays to store temperature values of 3 weeks (7 days in a week) and calculate and display average for each week. I think I am close, but my code returns null as value for average, not sure what is wrong! This is the code:
Instantiable class:
public class Temperature {
private double tempData; //array to store temperature readings from 3 weeks
private double avgOfWeek; // array to store avg of each week;
public Temperature () {; // constructor to initialize instance variables with their default values, ie. tempData with null
}
// setter
// setter method to assign / store a 2D array of double elements in the instance variable tempData
public void setTemp (double tempData) {
this.tempData = tempData;
}
// processing
public void calcAvg () {
double avgOfWeek = new double [3];
double sum = new double [3];
int counter = 0;
for (int row=0; row < tempData.length; row ++) {
for (int col=0; col < tempData[row].length; col++) {
sum [row]= sum [row] + tempData [row][col];
}
avgOfWeek [row] = sum[row]/ tempData[row].length;
}
}
// getter method to retrieve the average
public double getAvg () {
return avgOfWeek;
}
}
Application:
public class TemperatureApp {
public static void main (String args) {
// declare a 2D array to store values of temperature
double temp = new double {
{1,2,3,4,5,6,7},
{7,6,5,4,3,2,1},
{1,2,3,4,3,2,1},
};
Temperature myTemp = new Temperature ();
myTemp.setTemp(temp);
myTemp.calcAvg();
double a = myTemp.getAvg();
System.out.println (" The average temperature is " + a);
}
}
java arrays
java arrays
edited Jan 3 at 16:07
Sofo Gial
515619
asked Jan 3 at 15:08
MszaMsza
83
edited Jan 3 at 16:07
Sofo Gial
515619
asked Jan 3 at 15:08
MszaMsza
83
edited Jan 3 at 16:07
Sofo Gial
515619
edited Jan 3 at 16:07
Sofo Gial
515619
edited Jan 3 at 16:07
Sofo Gial
515619
515619
asked Jan 3 at 15:08
MszaMsza
83
asked Jan 3 at 15:08
MszaMsza
83
asked Jan 3 at 15:08
MszaMsza
83
83
2
You have twoavgOfWeekvariables, remove the one declared in thecalcAvgmethod .
– Arnaud
Jan 3 at 15:11
1
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
thank you! thank really helped!
– Msza
Jan 3 at 18:47
add a comment |
2
You have twoavgOfWeekvariables, remove the one declared in thecalcAvgmethod .
– Arnaud
Jan 3 at 15:11
1
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
thank you! thank really helped!
– Msza
Jan 3 at 18:47
2
2
You have two
avgOfWeek variables, remove the one declared in the calcAvg method .– Arnaud
Jan 3 at 15:11
You have two
avgOfWeek variables, remove the one declared in the calcAvg method .– Arnaud
Jan 3 at 15:11
1
1
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
thank you! thank really helped!
– Msza
Jan 3 at 18:47
thank you! thank really helped!
– Msza
Jan 3 at 18:47
add a comment |
1 Answer
1
active
oldest
votes
4
You're not initializing the right variable double avgOfWeek = new double [3];. remove the code double .
...
public void calcAvg () {
avgOfWeek = new double [3];
double sum = new double [3];
....
Right now you're creating a new local variable with the same name. Whenever you're using it in that method, it only references that one.
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
4
You're not initializing the right variable double avgOfWeek = new double [3];. remove the code double .
...
public void calcAvg () {
avgOfWeek = new double [3];
double sum = new double [3];
....
Right now you're creating a new local variable with the same name. Whenever you're using it in that method, it only references that one.
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
add a comment |
4
You're not initializing the right variable double avgOfWeek = new double [3];. remove the code double .
...
public void calcAvg () {
avgOfWeek = new double [3];
double sum = new double [3];
....
Right now you're creating a new local variable with the same name. Whenever you're using it in that method, it only references that one.
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
add a comment |
4
4
4
You're not initializing the right variable double avgOfWeek = new double [3];. remove the code double .
...
public void calcAvg () {
avgOfWeek = new double [3];
double sum = new double [3];
....
Right now you're creating a new local variable with the same name. Whenever you're using it in that method, it only references that one.
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
You're not initializing the right variable double avgOfWeek = new double [3];. remove the code double .
...
public void calcAvg () {
avgOfWeek = new double [3];
double sum = new double [3];
....
Right now you're creating a new local variable with the same name. Whenever you're using it in that method, it only references that one.
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
edited Jan 3 at 15:17
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
answered Jan 3 at 15:11
NeijwiertNeijwiert
723418
723418
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
add a comment |
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
thank you very much, this works now!
– Msza
Jan 3 at 18:48
thank you very much, this works now!
– Msza
Jan 3 at 18:48
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
@Msza No problem, glas to help. Could you mark my question as the answer so this question gets closed?
– Neijwiert
Jan 4 at 7:39
add a comment |
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2
You have two
avgOfWeekvariables, remove the one declared in thecalcAvgmethod .– Arnaud
Jan 3 at 15:11
1
the final print is not going to show what you expect. Check here how to print an array
– jhamon
Jan 3 at 15:15
thank you! thank really helped!
– Msza
Jan 3 at 18:47