Question

[C++]

Please help to understand why this code need to have "void calcSales(CorpData &);" and "void displayDivInfo(CorpData);". Thanks!

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#include <iostream>
#include <string>

using namespace std;

struct CorpData
{
string diviName;
double firstQua, secondQua, thirdQua, fourthQua, annualSales, quaAvg;
  
CorpData(string d, double fq, double sq, double tq, double frq)
{
diviName = d;
firstQua = fq;
secondQua = sq;
thirdQua = tq;
fourthQua = frq;
}

};

void calcSales(CorpData &);
void displayDivInfo(CorpData);

int main()
{   
CorpData West("West", 10000, 20000, 30000, 40000);
CorpData East("East", 90000, 100000, 110000, 0);
CorpData North("North", 50000, 60000, 70000, 80000);
CorpData South("South", 120000, 130000, 140000, 150000);

calcSales(West);
calcSales(East);
calcSales(North);
calcSales(South);

displayDivInfo(West);
displayDivInfo(East);
displayDivInfo(North);
displayDivInfo(South);
return 0;
}
void calcSales(CorpData &d)
{
d.annualSales = d.firstQua + d.secondQua + d.thirdQua + d.fourthQua;
d.quaAvg = d.annualSales/4;
}
void displayDivInfo(CorpData d)
{
cout << "Division name:     " << d.diviName << endl;
cout << "Annual Total:    $" << d.annualSales << endl;
cout << "Annual Quarterly:    $" << d.quaAvg;
cout << endl;
cout << endl;
}

Answer 1

Note: Could you plz go through this explanation which I provideed and let me know if u need more explanation
=================================

Note :

In C++ , we have to declare the function headers before the main() function when we want to provide any functions in the c++.For the function headers which we declared before the main() function we have to provide the function implemenattion after the main() function.

=========================================

#include <iostream>
#include <string>

using namespace std;

// Declaring Struct Named CorpData
struct CorpData
{
// Declaring varibales
string diviName;
double firstQua, secondQua, thirdQua, fourthQua, annualSales, quaAvg;
  
CorpData(string d, double fq, double sq, double tq, double frq)
{
diviName = d;
firstQua = fq;
secondQua = sq;
thirdQua = tq;
fourthQua = frq;
}

};

// Function declarations
void calcSales(CorpData &);
void displayDivInfo(CorpData);

// main() function
int main()
{   
CorpData West("West", 10000, 20000, 30000, 40000);
CorpData East("East", 90000, 100000, 110000, 0);
CorpData North("North", 50000, 60000, 70000, 80000);
CorpData South("South", 120000, 130000, 140000, 150000);

calcSales(West);
calcSales(East);
calcSales(North);
calcSales(South);

displayDivInfo(West);
displayDivInfo(East);
displayDivInfo(North);
displayDivInfo(South);
return 0;
}

/* Function implementation which will calculate
* and return the average of 4 quarters sales of CorpData
*/
void calcSales(CorpData &d)
{
d.annualSales = d.firstQua + d.secondQua + d.thirdQua + d.fourthQua;
d.quaAvg = d.annualSales/4;
}

/* Function implementation which will display
* the information of CorpData
*/
void displayDivInfo(CorpData d)
{
cout << "Division name: " << d.diviName << endl;
cout << "Annual Total: $" << d.annualSales << endl;
cout << "Annual Quarterly: $" << d.quaAvg;
cout << endl;
cout << endl;
}

===============================================

Output:

C:\Program Files (x86)\Dev-Cpp\MinGW64\bin\CorpDataClass.exe Division name: West Annual Total: $100000 Annual Quarterly: $25000 Division name: East Annual Total: $300000 Annual Quarterly: $75000 Division name: North Annual Total: $260000 Annual Quarterly: $65000 Division name: South Annual Total: $540000 Annual Quarterly: $135000 Process exited after 0.02983 seconds with return value o Press any key to continue ...

==================================Thank You