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# a "temp conversion" programme

 P: n/a i have created a new temperature conversion programme. it converts a temperature from Fahrenheit to Celsius or from Celsius to Fahrenheit at user's will. tell em if i need some improvements: // conversion of temperature // using Centigrade and Fahrenheit #include int main() { double centi; double fahr; char ans; std::cout << "do you want to convert a Centigrade into Fahrenheit: [y/n]"; std::cin >ans; if(ans == 'y') { std::cout << "Enter temperature in Centigrade: "; std::cin >centi; fahr = (9.0/5.0 * centi) + 32; std::cout << centi << " centigrade = " << fahr << " fahrenheit" << "\n"; } else { std::cout << "Enter temperature in Fahrenheit: "; std::cin >fahr; centi = 5.0/9.0 * (fahr - 32); std::cout << fahr << " farenheit = " << centi << " centigrade" << "\n"; } return 0; } -- arnuld http://arnuld.blogspot.com Mar 5 '07 #1
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 P: n/a arnuld wrote: i have created a new temperature conversion programme. it converts a temperature from Fahrenheit to Celsius or from Celsius to Fahrenheit at user's will. tell em if i need some improvements: // conversion of temperature // using Centigrade and Fahrenheit #include int main() { double centi; double fahr; char ans; std::cout << "do you want to convert a Centigrade into Fahrenheit: [y/n]"; std::cin >ans; if(ans == 'y') { std::cout << "Enter temperature in Centigrade: "; std::cin >centi; fahr = (9.0/5.0 * centi) + 32; std::cout << centi << " centigrade = " << fahr << " fahrenheit" << "\n"; } else { std::cout << "Enter temperature in Fahrenheit: "; std::cin >fahr; centi = 5.0/9.0 * (fahr - 32); std::cout << fahr << " farenheit = " << centi << " centigrade" << "\n"; } return 0; } Well, you could format your output better... How about rounding to two digits after the decimal point? That way you wouldn't get values like "3.3333333333333" in your output. If you are interested in achieving this, #include the file 'iomanip' and look up on the manipulators 'fixed' and 'setprecision'. HTH, - J. Mar 5 '07 #2

 P: n/a On Mar 5, 10:25 am, Jacek Dziedzic

 P: n/a arnuld wrote: >On Mar 5, 10:25 am, Jacek Dziedzic wrote: > Well, you could format your output better...How about rounding to two digits after the decimal point?That way you wouldn't get values like "3.3333333333333"in your output. If you are interested in achieving this, #includethe file 'iomanip' and look up on the manipulators'fixed' and 'setprecision'. they are for "floats". i have tried that, you can not use them for "doubles" Try harder. #include #include using namespace std; const double d=1.0/3.0; int main() { cout << fixed << setprecision(2) << d << ' ' << setprecision(10) << d << endl; } HTH, - J. Mar 5 '07 #4

 P: n/a On Mar 5, 7:35 am, "arnuld"

 P: n/a On Mar 5, 12:06 pm, Jacek Dziedzic Try harder. #include #include using namespace std; const double d=1.0/3.0; int main() { cout << fixed << setprecision(2) << d << ' ' << setprecision(10) << d << endl; } Erm... and i was using "d.precision(3)". BTW, i removed "fixed" from your code. i does not make any difference. Mar 5 '07 #6

 P: n/a arnuld wrote: >On Mar 5, 12:06 pm, Jacek Dziedzic > Try harder.#include#includeusing namespace std;const double d=1.0/3.0;int main() { cout << fixed << setprecision(2) << d << ' ' << setprecision(10) << d << endl;} Erm... and i was using "d.precision(3)". BTW, i removed "fixed" from your code. i does not make any difference. Sure it does, you just didn't notice. I'll let you figure it out, though. Try this #include #include using namespace std; int main() { cout << setprecision(3) << 123.456 << ' ' << fixed << setprecision(3) << 123.456 << endl; } - J. Mar 5 '07 #7

 P: n/a On Mar 5, 2:09 pm, Jacek Dziedzic BTW, i removed "fixed" from your code. i does not make any difference. Sure it does, you just didn't notice. I'll let you figure it out, though. Try this #include #include using namespace std; int main() { cout << setprecision(3) << 123.456 << ' ' << fixed << setprecision(3) << 123.456 << endl; } yes, i noticed now. the output of your programme is: 123 123.456 now here is some interesting pattern: 1.) << setprecision(3) << 123.456 << fixed << ' ' << setprecision(3) << 123.456 OUTPUT: 123 123.456 here i have use /fixed/ as like a prefix 2.) << fixed << setprecision(3) << 123.456 << ' ' << setprecision(3) << 123.456 << endl; OUTPUT: 123.456 123.456 here 1 /fixed/ worked for both. 3.) << setprecision(3) << 123.456 << ' ' << setprecision(3) << 123.456 << fixed << endl; } OUTPUT: 123 123 /fixed/ doe snot work here. i want to know how exactly /fixed/ work, in context to patterns 1,2 and 3. ? Mar 5 '07 #8

 P: n/a arnuld wrote: >On Mar 5, 2:09 pm, Jacek Dziedzic BTW, i removed "fixed" from your code. i does not make any difference. Sure it does, you just didn't notice. I'll let you figure it out,though. Try this#include #include using namespace std;int main() { cout << setprecision(3) << 123.456 << ' ' << fixed << setprecision(3) << 123.456 << endl;} yes, i noticed now. the output of your programme is: 123 123.456 now here is some interesting pattern: 1.) << setprecision(3) << 123.456 << fixed << ' ' << setprecision(3) << 123.456 OUTPUT: 123 123.456 here i have use /fixed/ as like a prefix 2.) << fixed << setprecision(3) << 123.456 << ' ' << setprecision(3) << 123.456 << endl; OUTPUT: 123.456 123.456 here 1 /fixed/ worked for both. 3.) << setprecision(3) << 123.456 << ' ' << setprecision(3) << 123.456 << fixed << endl; } OUTPUT: 123 123 /fixed/ doe snot work here. i want to know how exactly /fixed/ work, in context to patterns 1,2 and 3. One way would be to google for "fixed", "setprecision" and "manipulators". Consulting your favourite C++ textbook would be another. Anyway, fixed did not work in your last example, since it was output _after_ your numbers. They were output already, so it had no chance to act. Anyway 2, with 'fixed' the 'setprecision' manipulator tells the stream how many digits after the decimal point you want to output, without fixed it tells how many digits _total_ you want to output. HTH, - J. Mar 5 '07 #9

 P: n/a On Mar 5, 4:06 pm, Jacek Dziedzic One way would be to google for "fixed", "setprecision" and "manipulators". i did that after reading your reply. sorry... i found one more manipulator named /scientific/ an opposite of / fixed/ Consulting your favourite C++ textbook would be another. yes, i tried Stroustrup before posting here my 3 patterns but it did not tell me anything useful, totally unlike Google. Anyway, fixed did not work in your last example, since it was output _after_ your numbers. They were output already, so it had no chance to act. Anyway 2, with 'fixed' the 'setprecision' manipulator tells the stream how many digits after the decimal point you want to output, without fixed it tells how many digits _total_ you want to output. yes, i understood now, except one thing. from pattern '2' above, does one /fixed/ works for all subsequent /setprecision(s)/ ? HTH, of course that helped :-) Mar 5 '07 #10

 P: n/a arnuld wrote: >On Mar 5, 4:06 pm, Jacek Dziedzic > One way would be to google for "fixed", "setprecision" and "manipulators". i did that after reading your reply. sorry... i found one more manipulator named /scientific/ an opposite of / fixed/ Almost an opposite. In fact you have three modes -- the default (not fixed and not scientific), fixed and scientific. yes, i understood now, except one thing. from pattern '2' above, does one /fixed/ works for all subsequent /setprecision(s)/ Yes, as long as they are on the same output stream. HTH, - J. Mar 5 '07 #11

 P: n/a On Mar 6, 1:28 am, Jacek Dziedzic

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