Question

Write a C++ program that do :

Suppose we have three cities

city1,city2,city3

The information of each city will be stored in one row in 2 D array of integers

Suppose you want to store the number of accidents that happens in each week on July.

The program should read the values of each week for each city from KB.

Ex. Enter city1 information

Week 1: …

Week 2: …

Week 3: …

Week 4: …

Enter city2 information

Week 1: …

…..

and so on

Use for loops for entering values. Use the same for loops for entering values for the whole cities. (you are now allowed to make separate loop for each city )

The program should find which week has the largest number of accidents. ( write a function for this and call it)

Important Note :using pointers .

Answer 1

• Inorder to get the inputs for three cities, write a for loop that iterates three times
• And to get data for 4 weeks for each of these cities, write a for loop inside the previous loop that iterates 4 times.
• To store these elements in a 2D array, define a array of size 3x4. It is better to dynamically allocate these arrays just before reading in the data
• we will use a function calcMax() to calculate the city with maximum number of accidents.
• this function will take in the address of 2D array.
• to access the row and columns of this array, we will be adding the offset to the base address of the array
• ith row of our array can be accessed by using *(array + i). jth column in the ith row can be accesed by *(*(array + i) + j)

program :

#include <iostream>

using namespace std;

void calcMax(int** accidentData){
int max = 0;
int maxCount = 0;
for(int i = 0; i<3;i++){
int count = 0;
for(int j = 0; j<4; j++){
count+= *(*(accidentData+i)+j);
}
if(count>maxCount){
max = i;
maxCount = count;
}
}
cout<<"city "<<max+1<<" has most number of accidents";
cout<<" with a tolal of "<<maxCount<<" accidents in july\n";
}

int main(){
int* accidentData[3];
for(int i = 0; i<3; i++){
accidentData[i] = new int[4];
cout<<"Enter city"<<i+1<<" information\n";
for(int j = 0; j<4; j++){
cout<<"Week "<<j+1<<" "; cin>>accidentData[i][j];
}
}
calcMax(accidentData);
return 0;
}

output: