Reputation: 199
Write a method scalarMultiply which takes as input a double[] array, and a double scale, and returns void. The method should modify the input array by multiplying each value in the array by scale. . Question to consider: When we modify the input array, do we actually modify the value of the variable array ?
Here is what i did until now, but i dont know what i did wrong because it still is not working.
public class warm4{
public static void main(String[] args){
double[] array1 = {1,2,3,4};
double scale1 = 3;
}
}
public static void scalarMultiply(double[] array, double scale){
for( int i=0; i<array.length; i++){
array[i] = (array[i]) * scale;
System.out.print(array[i] + " ");
}
}
}
Upvotes: 2
Views: 6181
Reputation: 1048
You're never calling scalarMultiply and the number of the brackets is incorrect.
public class warm4{
public static void main(String[] args){
double[] array1 = {1,2,3,4};
double scale1 = 3;
scalarMultiply(array1, scale1);
}
public static void scalarMultiply(double[] array, double scale){
for( int i=0; i<array.length; i++){
array[i] = (array[i]) * scale;
System.out.print(array[i] + " ");
}
}
}
Upvotes: 2
Reputation: 34186
Your method is OK. But you must call it from your main
:
public static void main(String[] args){
double[] array1 = {1,2,3,4};
double scale1 = 3;
scalarMultiply(array1, scale1);
for (int i = 0; i < array1.length; i++) {
System.out.println(array1[i]);
}
}
Upvotes: 0