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aight im doing an exercise in a book and i want it to ask how many total points can the student earn which i can do that but i i want it to say like press 'q' to quite and obviously points are numbers and thats crossing variable types so is there a way i can make so i can still ask for a number and use it for a number while allowing a 'q' for input i tryed jus flat out using 'q' there but it jus repeated some output and did nuthin so can anyone help out real fast thanx bye
take it easy take your time to write a post(if u want uss to do the same)
disclaimer: i have almost no idea what you mean.
read everything in as a string, test for 'q' or 'Q', then convert to int or float and proceed
Input everything as a string, then decide how to convert it by looking at the chars typed in
um two variables of int and char
get the number
ask if they want to do it again (y/n)
get char
repeat if y.
use swich as after the () of the main
int main() {
cout inter the first char
switch {char x of
case 'c' : continure {
youwrite here your progam
}
case' q': break;
}// switch
cout <<" Good by"
}/main
oh so i ask seperately if they want to continue or not? i cant make it all one question?
> oh so i ask seperately if they want to continue or not? i cant make it all one question?
Of course you can
Or any variation on this theme which you care to imagineCode:char answer[100];
cin.getline( answer, sizeof(answer) );
if ( isdigit( answer[0] ) {
// convert answer to a number
} else
if ( answer[0] == 'y' ) {
// yes
} else
if ( answer[0] == 'n' ) {
// no
}
hmm while that makes sense except i havent learned what the isdigit() does exactly my guess is it converts the numberal naswer to digits or gets the numeric value for strings?
Nope. Try putting a question mark after the function name for a clue.
aight heres what i got
without the ? mark i have an error saying isdigit is an undeclared identifyer so is there a header that i need for this thing?
i think im getting the hint for the isdigit so it would ask with a ? sumwhere which i cant figure out quite where to put since i keep getting errors and i dont understand them since ive never known what ? marks do in coding altho i have seen them but heres what i got
i also tryed like 5 places for the ? mark jus to see what it did and i kept getting these 4 errors or errors similar to them in all cases
#include <iostream.h>
int main()
{
char answer[100];
cin.getline( answer, sizeof(answer) );
if ( isdigit?( answer[0] )) {
// convert answer to a number
} else
if ( answer[0] == 'y' ) {
cout<<"this is the yes slot"<<endl;
// yes
} else
if ( answer[0] == 'n' ) {
cout<<"this is the no slot"<<endl; // no
}
return 0;
}
--------------------Configuration: isdigit - Win32 Debug--------------------
Compiling...
isdigit.cpp
C:\Windows\Desktop\c++\isdigit.cpp(6) : error C2065: 'isdigit' : undeclared identifier
C:\Windows\Desktop\c++\isdigit.cpp(6) : error C2059: syntax error : ','
C:\Windows\Desktop\c++\isdigit.cpp(6) : error C2143: syntax error : missing ';' before '{'
C:\Windows\Desktop\c++\isdigit.cpp(8) : error C2181: illegal else without matching if
Error executing cl.exe.
isdigit.obj - 4 error(s), 0 warning(s)
include the string header file or ctype for 'isdigit'
I dont think Sorensen meant to literally put a '?' after isdigit() in your code. He meant it as a response to your question as to what is the purpose of isdigit(). Think about it a little. Or even better, use one of those bizarre things called 'search engines.' I've heard that the one called 'www.google.com' is pretty good. Kinda high-tech though. Alternatively, it is included in the functions section of this site.