Question

我正在开发一个程序，打印出一个填充了随机生成的整数的表。大多数逻辑相对简单并且运行良好。我想做的一件事是添加并打印每列的总值，以及表中所有值的最终总和。我一直在寻找一个答案，但没有找到解决它的运气。

rowNbr = 7; // ROW CONTROLS
colNbr = 5; //COLUMN CONTROLS

rpt01 = String.format("%0" + (colNbr-1) + "d", 0).replace("0",dash); //Redefine rpt01
colBld = String.format("|---------------|%s\n",rpt01); //Redefine colBld

String cnrTxt = "First Quarter";

System.out.printf(colBld);
System.out.printf("|%-15s",cnrTxt);

for(int i = 1; i < colNbr; i = i++){ //Open for loop (columns)

String regTxt = "Region " + i++;

System.out.printf("|%-10s",regTxt);

} //End for

System.out.printf("|\n");

//Initialize array

int sales[] = new int[100];
  int idx = 0;
for(int i = 1; i <= rowNbr-3; i++){

String prodTxt = "Product " + i;

System.out.printf(colBld);
System.out.printf("|%-15s|",prodTxt);


for(int j = 0; j < colNbr-1; j++){ //Open for loop (columns 2)

    sales[idx] = (int)(Math.random() * 16 + 1);
    System.out.printf("%-10d|",sales[idx]);
    idx++;
} //End for

System.out.printf("\n");

} //End for

int totalNbr = 0; //Placeholder zero
int regNbr = 0; //Placeholder zero

String totalTxt = "Final Total: ";
String regTxt = "Region Totals";

System.out.printf(colBld);
System.out.printf("|%-15s|%-10s|\n",regTxt,regNbr); 
System.out.printf(colBld);
System.out.printf("|%s%s\n",totalTxt,totalNbr); 
System.out.printf(colBld);

以下是代码运行后的状态：

|---------------|----------|----------|----------|----------|
|First Quarter  |Region 1  |Region 2  |Region 3  |Region 4  |
|---------------|----------|----------|----------|----------|
|Product 1      |2         |10        |3         |1         |
|---------------|----------|----------|----------|----------|
|Product 2      |15        |15        |7         |16        |
|---------------|----------|----------|----------|----------|
|Product 3      |15        |13        |7         |9         |
|---------------|----------|----------|----------|----------|
|Product 4      |4         |14        |11        |11        |
|---------------|----------|----------|----------|----------|
|Region Totals  |0         |
|---------------|----------|----------|----------|----------|
|Final total: 0
|---------------|----------|----------|----------|----------|

老实说，不知道从哪里开始。任何帮助表示赞赏！

Answer 1

Since you have already sequentially filled the sales array with random Integer values to represent sequentially displayed Regions it is then a simple matter of stepping through the array elements in increments of the number of regions and summing the elements detected in each step.

To determine the actual number of Regions that will be displayed and the number of Region Totals to keep track of, we can base it from the value contained within the colNbr variable less 1 (5 - 1 = 4 regions will be displayed).

Knowing this we declare yet another integer Array named regionTotals and give it a length of 4:

int[] regionTotals = new int[colNbr-1];

Now it's a matter of stepping through the sales array elements and summing the proper sales array element to the proper regionTotal element, like this:

int regionCols = colNbr-1;
int[] regionTotals = new int[regionCols];
int stepCounter = 0;
for (int i = 0; i < sales.length; i++) {
    stepCounter++;
    if (stepCounter > regionCols) { stepCounter = 1; }
    int regionIndex = (stepCounter - 1);
    regionTotals[regionIndex]+= sales[i];
}
System.out.println("\nRegion Totals: " + Arrays.toString(regionTotals) + "\n");

Place the above code directly above the declaration & initialization of the totalNbr integer variable:

int totalNbr = 0; //Placeholder zero

How you format the regionTotals array elements into your table is up to you but do remember, the Array is zero based so the element at index 0 of the array contains the summation for Region 1.

查找列中所有值的总和[RNG]

1 个答案: