Real Fast While Loop Question

[Undermine]

[PHP]#include <iostream>

using std::cout;
using std::cin;
using std::endl;


int main(void)
{

int m1;
int g1;
int x=1;
int MPG;
m1=287,200,120;
g1=13,10,5;


while ( x <= 3 )
{
MPG= m1/g1;
cout<<" MPG this tankful:" << MPG << endl;
x++;

}


char holdscr;
cout << "\n\n\t*** Enter a character and press return to exit the program! ***\n\n\t"<< std::endl;
cin >> holdscr;

return 0;
}[/PHP]

How do i make it so it computers different numbers per MPG, as it it would read of the row of m1 and divide it by g1. Do i use vectors here?

[boxfish]

m1=287,200,120;
is not valid code. If the amount of numbers isn't going to change while the program is running, use a static array:
int m1[] = {287, 200, 120};
But if you're going to be adding more numbers while the program is running (you currently aren't), you should use a vector. May I suggest using doubles instead of ints for accuracy? Just a thought.
Hope this helps.

[whodgson]

Doubles are more accurate than ints? how?
As boxfish says:
set up one array for distance units e.g. dougle a[] ={123,145,167};
and one for fluid volume units e.g. double b[]={12,14,16};
now mpg equals a[0]divided by b[0] like:

for(int i=0;i<3;i++)
cout<<"mpg "<<i<<"="<<a[i]/b[i]<<endl;

/*prints mpg 0=10.25
mpg 1= 10.357142
mpg 2= 10.4375*/

[Undermine]

thanks both of you got it :)

[JosAH]

m1=287,200,120;
is not valid code.

That code is (syntactically) valid; it just doesn't do what the OP had in mind: that
sequence expression results in m1=120, no more no less. Note that a sequence
operator in an initialization expression is not allowed:

int m1=287, 200, 120;
 

while a nested sequence expression is allowed there:

int m1=(287, 200, 120);
 

The C syntax and its accompanying semantics have many many idiosyncrasies ;-)

kind regards,

Jos

[donbock]

Doubles are more accurate than ints? how?

The ratio of two integers is more accurately expressed using floating-point, so MPG should be a double. If m1 and g1 are integers then the inaccurate integer ratio is what gets converted to floating-point.