Question

以下是我之前计划的后续行动。它不会打印平均值的正确信息。请帮忙。

PRINT

Listed below is your totals within each Motion Picture Company
----------------------------------------------------------------
Name              |Paramount    |Century Fox    |Warner    |WaterFront    |Total

Alyssa    |        20|        30|         0|        40|         0|                   |90

Total: 90
Average: inf
Max: 40

我的代码：我正在尝试在我的打印数组中添加平均总数。似乎在必填字段中返回了一些未知信息，我似乎无法弄清楚原因。我希望有人能尽快帮助我！

#include <iostream>
#include "motionPicture.h"
#include <iomanip> //to use setw
#include <cstring>
#include <string>

using namespace std;

int motionPicture :: count = 0;

motionPicture :: motionPicture() {

    //initalize the table
    for (int i =0; i < rows; i++){

            for (int j=0; j<columns; j++){

                    table[i][j] =0;
            }//end j for loop
    }//end i for loop
}//end constructor

来自getData（）函数的部分输入：

    int rowNum=0;
    rowNum++;
    string1[count] = name;
    count++;

    cout <<"Input the data in the following format."<<endl;
    cout <<"Motion Picture Number <space>  Cost of movies "<<endl;
    cout <<"Enter -1 <space> 0 to end"<<endl<<endl;

    cin >> motion >> cost;

    while (motion != -1) {

                    table[rowNum-1][motion-1] +=cost;

                    cout <<"Enter Motion Picture <space> Cost of movies" <<endl;
                    cin >> motion >>cost;
            }//end cost while

打印出有平均输出问题的数组

void motionPicture :: printArray() {
//need to pass an int in array element variable
int size =0;
size =sizeof(table)/ sizeof(table[0][0]);
double max = table[0][0];
double min = table[0][0];

cout <<"Listed below is your totals within each Motion Picture Company"<<endl;
cout <<"----------------------------------------------------------------"<<endl;

cout<<"Name" << setw(15)<<'|'<<setw(5)<< "Paramount" <<setw(5)<<'|'<<setw(5)<< "Century Fox" <<setw(5)<<'|'<<setw(5)<<
    "Warner"<<setw(5)<<'|'<<setw(5) <<"WaterFront" <<setw(5)<<'|'<<setw(5)<<"Total"<<endl<<endl;

    for (int i= 0; i <count; i++){
               double total =0;
               double average = 0;
               cout<<string1[i]<<setw(5)<<'|';

         for (int j=0; j<columns; j++) {

               //cout <<string1[i]<<"\t";
               cout <<setw(10)<<table[i][j]<<'|';
               //input total

               total += table[i][j];
              // double totalSales = total;
//              average = i[i][j] + j[i][j]'//totalSales/(i*j);
              average= total/table[i][j];
               if (table[i][j] > min)
                         max = table[i][j];
               else if (table[0][0] < min)
                         min = table[i][j];

         }//end j loop

    cout <<setw(20)<<'|'<<total<<"\n";
    cout<<endl;
    cout <<"Total: "<<total<<endl;
    cout<<"Average: " <<average/table[rowNum][motion]<<endl;
    cout<<"Max: " <<max<<endl<<endl;

    }//end i loop
}//end print

功能修正

void motionPicture :: printArray() {
//need to pass an int in array element variable
int size =0;
size =sizeof(table)/ sizeof(table[0][0]);
double max = table[0][0]++;
double min = table[0][0]++;


cout <<"Listed below is your totals within each Motion Picture Company"<<endl;
cout <<"----------------------------------------------------------------"<<endl;

cout<<"Name" << setw(10)<<'|'<<setw(5)<< "Paramount" <<setw(5)<<'|'<<setw(5)<< "Cent Fox" <<setw(6)<<'|'<<setw(5)<<
    "Warner"<<setw(8)<<'|'<<setw(5) <<"WaterFront" <<setw(4)<<'|'<<setw(5)<<"Total"<<endl<<endl;

    for (int i= 0; i <count; i++){
               double total =0;
               double average = 0;
               cout<<string1[i]<<setw(8)<<'|';

         for (int j=0; j<columns; j++) {

               //cout <<string1[i]<<"\t";
               cout <<setw(7)<<table[i][j]<<setw(7)<<'|'<<setw(7);
               //input total

               total += table[i][j];
              average = total/columns;
               if (table[i][j] > min)
                         max = table[i][j];
               else if (table[0][0] < min)
                         min = table[i][j];



         }//end j loop

    cout <<setw(5)<<total<<"\n";
    cout<<endl;
    cout <<"Total: "<<total<<endl;
    cout<<"Average: " <<average<<endl;
    cout<<"Max: " <<max<<endl<<endl;

    }//end i loop
}//end print

正确打印！：）

Listed below is your totals within each Motion Picture Company
----------------------------------------------------------------
Name         |Paramount    |Cent Fox     |Warner       |WaterFront   |Total

Alyssa       |     22      |     20      |      0      |      0      |   42

Total: 42
Average: 10.5
Max: 22

Wes       |     40      |     60      |      0      |      0      |  100

Total: 100
Average: 25
Max: 60

Answer 1

average应该通过将总数除以条目数来计算。您有total中的总数和columns中的条目数（假设您想要列平均值）。所以你只需要在列（j）循环结束时使用它。

average = total / columns;

并打印出来。或者，更简单地说，您可以打印出total / columns。

在2D数组中查找平均值：FIXED

1 个答案: