Will this code work?

[ade161]

Oh, heavens...

The last few post have been very straightforward, please try to concentrate.

Imagine you're the CPU executing the code, line by line. This is a part of your original program:

// You're interested in totalCharge, ignore other stuff.
int main()
{
//declare variables
float previousReadings = 0.0;
float currentReadings = 0.0;
float gallonsUsed = 0.0;
float totalCharge = 0.0;    // OK. Now totalCharge = 0.0 [remember the value]

//enter input items
cout <<"Enter the current readings:";    // totalCharge hasn't changed [still 0.0]
cin >> currentReadings;                     // totalCharge hasn't changed [still 0.0]
cout <<"Enter the previous readings:";   // totalCharge hasn't changed [still 0.0]
cin >> previousReadings;                   // totalCharge hasn't changed [still 0.0]

//calculates the gallons used
gallonsUsed = currentReadings - previousReadings;   // totalCharge hasn't changed [still 0.0]

//calculates the total charge -- BUT totalCharge hasn't changed [still 0.0]
if (totalCharge >= 16.67)   // totalCharge hasn't changed [still 0.0], so...
{
    // will this execute?
    totalCharge = (gallonsUsed / 1000) *7;
    cout <<"totalCharge:" << totalCharge << endl;
}
// etc...

so here is the corrected version

#include <iostream>
using namespace std;

int main()
{
//declare variables
float previousReadings = 0.0;
float currentReadings = 0.0;
float gallonsUsed = 0.0;
float totalCharge = 0.0;

//enter input items
cout <<"Enter the current readings:";
cin >> currentReadings;
cout <<"Enter the previous readings:";
cin >> previousReadings;

//calculates the gallons used and total charged
gallonsUsed = currentReadings - previousReadings;
totalCharge = (gallonsUsed / 1000) *7;

//calculates the total charge
if (totalCharge < 16.67)
{
totalCharge = 16.67;
cout <<"total charge:" << totalCharge << endl;
}
//end if

cout <<"gallons used:" << gallonsUsed << endl;
cout <<"total charge:" << totalCharge << endl;

return 0;
} //end of main function





does it make sense?