Question

The Weather Service Bureau department has data representing monthly rainfall for a year and we would like to create a table categorizing each month as rainy (rainfall 20% higher than average) dry (rainfall 25% lower than average) or average. The data file for monthly rain fall is called rainfall.txt.

rainfall.txt

95
100
120
130
135
145
155
185
190
160
130
120

Store the data file in the same folder (lab 6) of your lab6.cpp.

Output
The year's average monthly rainfall was 139 mm.
September has the highest rainfall (190 mm).
January has the lowes rainfall (95 mm)
Month      Rainfall(mm)   Classification
-------      ---------------      --------------
    1                   95                   Dry
    2                 100                   Dry
    3                 120               Average
    4                 130               Average
    5                 135               Average
    6                 145              Average
    7                 155              Average
    8                 185                Rainy
    9                 190                Rainy
10                 160             Average
11                 130             Average
12                 120             Average

Program Requirements:
Implement the following functions in the program:

void inputRainfall(int rainFal l[], int size)
The function reads the monthly rainfall from the file rainFall.txt and stores them in the array rainFall
int calculateAverageRainFall(int rainFall [], int size)
Return the average monthly rainfall
void classifyAndDisplayRainfall(int rainFall[], int months);
Classify and display each month as average, rainy, or dry.

Using Apples’ Xcode C++ compiler but would really like an explanation on importing the file data (rainfall.txt) to the program, can’t seem to get my array to use it.

void inputRainfall(int rainFall[], int size)

{

int i=0

ifstream in(“rainfall.txt”);

if(!in){

cout << “Encountered error opening file” << endl

return;

}

Answer 1

#include<iostream> //for cin and cout
#include<fstream> //for ifstream
#include<iomanip> //for setw
using namespace std;

int average; //to store the average of all rainfalls
//nputRainfall function populates rainFall array
//by reading data from rainfall.txt file
void inputRainfall(int rainFall[], int &size)
{
int i=0;
ifstream in("rainfall.txt");
if(!in){
cout << "Encountered error opening file" << endl;
return;
}
while(in>>i){
rainFall[size] = i;
size += 1;
}
in.close();
}

//calculateAverageRainFall function takes array and size of array
//and returns the average of all the rainfalls
int calculateAverageRainFall(int rainFall[],int size)
{
int sum=0;
for(int i=0;i<size;i++)
sum += rainFall[i];
return sum/size;
}

//displays the classification
void classifyAndDisplayRainfall(int rainFall[],int months)
{
cout<<setw(6)<<" Month"<<setw(12)<<" Rainfall(mm)"<<setw(15)<<" Classification"<<endl;
cout<<" ------ ----------- ---------------"<<endl;
for(int i=0;i<months;i++){
cout<<setw(6)<<(i+1)<<setw(12)<<rainFall[i]<<setw(15);
if(rainFall[i]>average*1.2)
cout<<"Rainy";
else if(rainFall[i]<average*0.75)
cout<<"Dry";
else cout<<"Average";
cout<<endl;
}
}

//main function implementation
int main()
{
int rainFall[100],size=0; //rainFall array to store rainfall values and
//size to store size of array
//calls the three functions
inputRainfall(rainFall,size);
average=calculateAverageRainFall(rainFall,size);
classifyAndDisplayRainfall(rainFall,size);
return 0;
}

//NOTE: rainfall.txt has the same values as shown in the screenshot above in question

//output screenshot

//any query, post in the comment section