// Output the array so that 10 elements per line are printed. for(int r = 0; r <

Question

// Output the array so that 10 elements per line are printed.

for(int r = 0; r < 5; r++)

{ for(int c = 0; c < 10; c++)

System.out.print(alpha[r*10+c]+" ");

System.out.println();

Please explain why this prints 10 elements per row at a time. I don't understand this portion of the code.

Entire code:

public static void main(String[] args) {

// Write a program that declares an array "alpha" of 50 elements of type "double".

double[] alpha = new double[50];

// Initialize the array so that the first 25 elements are equal to the square of the index variable

for(int i = 0; i < 25; i++) alpha[i] = i*i;

// the last 25 elements are equal to three times the index variable.

for(int i = 25; i < 50; i++) alpha[i] = 3*i; //

Output the array so that 10 elements per line are printed.

for(int r = 0; r < 5; r++) { for(int c = 0; c < 10; c++)

System.out.print(alpha[r*10+c]+" ");

System.out.println();

}

}

Explanation / Answer

Rewrite the code with proper indentation, to make it clear as:

//Output the array so that 10 elements per line are printed.
   for(int r = 0; r < 5; r++)
   {
       for(int c = 0; c < 10; c++)
           System.out.print(alpha[r*10+c]+" "); //Inner Loop Statement
       System.out.println(); //Outet Loop Statement
   }

Explanation:

In this piece of code, there are two loops, one outer loop (for(int r = 0; r < 5; r++) { ----- }) and one inner loop (for(int c = 0; c < 10; c++) { ------ }).

1. Outer Loop runs from starting with r=0 to r=5.i.e., 5 times

2. For each value of 'r' , inner loop executes starting with c=0 to c=10 i.e., 10 times.

3. One and only one Statement present in inner loop is System.out.print(alpha[r*10+c]+" ");

4. System.out.print() is a standard ouput function, that prints the data to the console.

5.System.out.print() is different from System.out.println() since it doesn't print a new line after printing the data.

6. So the Statement present in inner loop doesn't print a new line and prints 10 elements in a row at a time and then executes outer loop statement and prints a new line.

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