the function inputAndValidate does not terminate to loop as i need it to loop 12 time

[CODE],[CODE = syntax]

//A c++ program that calculate and print parking charges

#include

using namespace std;

#include

const double minimumFee = 7.00;

const double hourlyFee = 1.75;

const int numOfCustomers = 2;

const int numOfMinsPerHour = 60;

void inputAndValidate(int,int,int,int);

void convertToMinutes(int&,int&,int&,int&);

void convertBackToTime(int&);

double calcCharge(int&,int&,double);

int entranceMinutes,exitMinutes,entranceTimeInMins,exitTimeInMins ;

int minutesParked,parkedMinutes,entranceHour,exitHour,parkedTime ;

int parkedHours;

double charge;

int main()

{

cout<<"Customer"<
for (int num = 1; num <= numOfCustomers; num++ )

{

inputAndValidate(entranceHour,entranceMinutes,exitHour,exitMinutes);

convertToMinutes(entranceHour,entranceMinutes,exitHour,exitMinutes);

convertBackToTime(minutesParked);

cout<
<
parkedHours,charge)<
}

return 0;

}

void inputAndValidate (int entranceHour,int exitHour,int entranceMinutes,int exitMinutes)

{

do{

if(numOfCustomers <= 12)

cout<<"Input the time you entered the garage"<
cin>>entranceHour >> entranceMinutes;

cout<<"input the time you left the garage"<
cin>>exitHour >> exitMinutes;

}while((entranceHour>0 && exitHour <= 24) && (entranceMinutes>=0 && exitMinutes <=59));

if(entranceHour == 24)

entranceMinutes = 00;

if(exitHour == 24)

exitMinutes =00;

else

cout<<"Input the valid time"<
}

void convertToMinutes(int& entranceHour,int& exitHour,int& entranceMinutes,int& exitMinutes)

{

int entraceTimeInMins = (entranceHour * numOfMinsPerHour + entranceMinutes);

int exitTimeInMins = (exitHour * numOfMinsPerHour + exitMinutes);

int minutesParked = (exitMinutes – entranceMinutes);

}

void convertBackToTime(int& minutesParked)

{

int parkedHours = (minutesParked / numOfMinsPerHour);

int parkedMinutes = (minutesParked % numOfMinsPerHour);

int parkedTime = (parkedHours && parkedMinutes);

}

double calcCharge(int& parkedHours ,int& parkedMinutes ,double charge)

{

if ((parkedHours>=3 && parkedHours<=24) && (parkedHours>0 && parkedMinutes<=60)){

int additionalHourMin = (parkedHours – 2);

double charge = (additionalHourMin * hourlyFee + minimumFee);

return charge;

}

else

if((parkedHours>=3 && parkedHours<=24) && (parkedMinutes = 0)){

int additionalHours = (parkedHours – 3);

double charge = (additionalHours * hourlyFee + minimumFee);

return charge;

}

return 0;

}

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