What are functions in C++??

[Thanz]

Just tell me what're functions??

Here're codes of some functions:

void getInput(double sal[][2], int numEmps);
void findUnluckies(double sal[][2], int numEmps, int lucky[]);
void markIfUnlucky(double sal[][2], int numEmps, int lucky[], int upperBound, int empNbr);


just tell me is there any hard n strict rule of writing a function???Like here's a function named getInput ...there is 1 array n 1 variable..If I would write this function how I'll get an idea I need 1 array n 1 variable??

[Catfish]

A function is a collection of instructions.
What you posted in your first post aren't functions. They're declarations of functions (names).

This is a function:

int function1(char a) // this is the name but notice how it doesn't end with semicolon ;
{
    // this is the body of the function, which contains the instructions, in the desired order
    std::cout << a << std::endl;
    return 1;
}

Read this: http://www.cplusplus.com/doc/tutorial/functions/

[Chriscpp]

Here you will learn about functions
http://www.cplusplus.com/doc/tutorial/functions/
http://www.cplusplus.com/doc/tutorial/functions2/

[zb0S216C]

In layman's terms, it's a group of instruction statements that are executed once the function is invoked (called). The code you posted are function prototypes; a requirement in C++. Prototype functions are function interfaces that describe the datum returned, parameters, and symbol. Prototypes omit the body until a later time.

_Wazzak

[Thanz]

Tyx for both of you..

[Thanz]

Can someone explain these bold lines const int arraySize=100;
double sal[arraySize][2];
int lucky[arraySize] = {0};
int numEmps;


cout << "\n Please enter the total number of employees in your company: ";
cin >> numEmps;
cout<<'\n';

getInput(sal, numEmps);

#include <iostream.h>
void getInput(double sal[][2], int numEmps);
void calcNetSal(double sal[][2], int numEmps);
void findUnluckies(double sal[][2], int numEmps, int lucky[]);
void markIfUnlucky(double sal[][2], int numEmps, int lucky[], int upperBound, int empNbr);
void printUnluckies(int lucky[], int numEmps);
main()
{
const int arraySize=100;
double sal[arraySize][2];
int lucky[arraySize] = {0};
int numEmps;


cout << "\n Please enter the total number of employees in your company: ";
cin >> numEmps;
cout<<'\n';

getInput(sal, numEmps);
void getinp(double sal[][2], int numEmps)
{
for (int i = 0; i < numEmps; i++)

{
cout << "\n Please enter the gross salary for employee no." << i << ": ";
cin >> sal[i][0];

}
}

cout << "\n\n Calculating the net salaries...";
calcNetSal(sal, numEmps);

cout << "\n\n Locating the unlucky employees ... ";
findUnluckies(sal, numEmps, lucky);

cout << "\n\n Printing the unlucky employees ... ";
printUnluckies(lucky, numEmps);
}

void calcNetSal(double sal[][2], int numEmps)
{
for (int i = 0; i < numEmps; i++)

{
if (sal[i][0] >=0 && sal[i][0] <= 5000)
{

sal[i][1] = sal[i][0];
}
else if(sal[i][0] >= 5001 && sal[i][0] <= 10000)
{
sal[i][1] = sal[i][0] - (.05 * sal[i][0]); }
else
if (sal[i][0] >= 10001 && sal[i][0] <= 20000) { sal[i][1] = sal[i][0] - (.10 * sal[i][0]); }
else
if (sal[i][0] >= 20001)
{

sal[i][1] = sal[i][0] - (.15 * sal[i][0]);
} else {
}
}
}
void findUnluckies(double sal[][2], int numEmps, int lucky[])
{
for (int i = 0; i< numEmps; i++)

{
if(sal[i][0] >= 0 && sal[i][0] <= 5000)
{

}
else if(sal[i][0]>=5001 && sal[i][0]<=10000)
{
markIfUnlucky(sal, numEmps, lucky, 5001, i);
}
else if (sal[i][0] >= 10001 && sal[i][0] <= 20000)
{
markIfUnlucky(sal, numEmps, lucky, 10001, i);
}
else if (sal[i][0] >= 20001)
{
markIfUnlucky(sal, numEmps, lucky, 20001, i);
}
}
}
void markIfUnlucky(double sal[][2], int numEmps, int lucky[], int upperBound, int empNbr)
{
for (int i = 0; i < numEmps; i++)
{

if (sal[i][0] < upperBound && sal[i][1] >= sal[empNbr][1])
{
lucky[empNbr] = 1;

break;
}
}
}
void printUnluckies(int lucky[], int numEmps)
{
for (int i = 0; i < numEmps; i++)
{
if(lucky[i] == 1)
{
cout <<"\n Employee No.: " << i;
}
}
}

[Catfish]

Can someone explain this program line by line???

No. Please don't ask that. We can't learn instead of you.
Learn, then ask questions about what you don't understand.

[Thanz]

Just tell me what're the bold lines doing in this part??

const int arraySize=100;
double sal[arraySize][2];
int lucky[arraySize] = {0};
int numEmps;


cout << "\n Please enter the total number of employees in your company: ";
cin >> numEmps;
cout<<'\n';

getInput(sal, numEmps);
void getinp(double sal[][2], int numEmps)
{
for (int i = 0; i < numEmps; i++)

{
cout << "\n Please enter the gross salary for employee no." << i << ": ";
cin >> sal[i][0];

}

[Catfish]

int lucky[arraySize] = {0};
It initializes the first element of the lucky array to 0.

getInput(sal, numEmps);
Calls the getInput function with the variables sal and numEmps as parameters.

Hey look, a nested function inside main(). Why does crap like this even compile?

[Thanz]

else if(sal[i][0]>=5001 && sal[i][0]<=10000)
{
markIfUnlucky(sal, numEmps, lucky, 5001, i); what does it mean??
}
else if (sal[i][0] >= 10001 && sal[i][0] <= 20000)
{
markIfUnlucky(sal, numEmps, lucky, 10001, i);
}
else if (sal[i][0] >= 20001)
{
markIfUnlucky(sal, numEmps, lucky, 20001, i);

[zb0S216C]

Thanz wrote:

int lucky[arraySize] = {0}; (sic)

Initializes all elements of the array to zero.

Thanz wrote:

getInput(sal, numEmps); (sic)

This is function call. More specifically, an invocation of getInput( ). During the invocation, two arguments are copied into the corresponding parameters of getInput( ).

_Wazzak