1. Given below is a C++ program which interactively gets data from standard input (keyboard) and displays output on standard output (screen). The program calculates and print bills for customers of Patrick gas station. Whenever a customer wants to fill up his gas tank, he will be asked for the gas amount to be filled in ringgit. He will also be asked if he needs any assistance from pump attendant. If yes (code 1) and his gas purchase is below 50 ringgit, an additional of 50 sen will be added to the gas bill, otherwise there will be no extra charge. The customer can make payment for his bill by cash (code -- 0) or by card (code -- 1). If he opts for the second method, his printed bill will show an extra 5% service charge (of total).

[NOTE: the program stops when there is no more customer to input]

#include

#include

using namespace std;

int main(){

double amt, total;

int assist, payment;

int count = 0;

char ans;

cout

do {

total = 0;

cout

cout

cin >> amt;

cout

cin >> assist;

cout

cin >> payment;

if (assist == 0)

total = amt;

else {

if (amt

total = amt + 0.50;

else

total = amt;

}

if (payment == 1)

total = total + 0.05 * total;

cout

cout RM "

total

cout

cout

cin >> ans;

cout

} while (toupper(ans)!= 'N');

return 0;

}

a. Copy and paste the code into your DevCpp editor [NOTE: you can get the softcopy of the lab question from e-learning].

b. Compile and run the code

c. Add/modify/delete the necessary codes in order to make the program reads data from input file, instead of the keyboard, and writes output into an output file, instead of the screen.

a Copy and paste the code into your Dexcoo editor (NOTE you can get the softcopy of the lab question from e-learning). b. Compile and run the code c. Add/modify/delete the necessary codes in order to make the program reads data from input file, instead of the keyboard, and writes output into an output file, instead of the screen Below are sample inputs and outputs for the program. Sample input Sample output (total payment) 30.00 10 50 20.00 0 0 20 100.000 1 105 80.00 11 84 8.00 1 0 8.5 Ans