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Just a tiny question.

64 New Member
Hey guys, thank for the help before and maybe you can help me a little more :-).

Here is the question they are asking...

"Write a statement that reads a floating point (real) value from standard input into temperature. Assume that temperature. has already been declared as an double variable."

I been trying to figure out what it means. I tried scanf, but just get some error message. Any help would be great. Thanks.

Oh btw this isn't a homework question. I been using this site to help me learn C++ the site is turingscraft.
Jan 23 '07 #1
12 9830
horace1
1,510 Recognized Expert Top Contributor
Hey guys, thank for the help before and maybe you can help me a little more :-).

Here is the question they are asking...

"Write a statement that reads a floating point (real) value from standard input into temperature. Assume that temperature. has already been declared as an double variable."

I been trying to figure out what it means. I tried scanf, but just get some error message. Any help would be great. Thanks.
post your code an we can try to figure out what is wrong
Jan 23 '07 #2
td0g03
64 New Member
post your code an we can try to figure out what is wrong
Well, I tried these..

Expand|Select|Wrap|Line Numbers
  1.  
  2. printf("%f",temperature);
  3.  
  4. and I tried
  5.  
  6. scanf("%f",temperature);
  7.  
  8. and I even messed around and gave temperature a value of 10.
  9.  
I just don't really understand what they are asking for exactly. I hope that helps...
Jan 23 '07 #3
horace1
1,510 Recognized Expert Top Contributor
Well, I tried these..

Expand|Select|Wrap|Line Numbers
  1.  
  2. printf("%f",temperature);
  3.  
  4. and I tried
  5.  
  6. scanf("%f",temperature);
  7.  
  8. and I even messed around and gave temperature a value of 10.
  9.  
I just don't really understand what they are asking for exactly. I hope that helps...
when scanf() converts characters into a numeric value it has to return that value into the variable. To do this it need the address in memory of the variable. To pass the address you use the & (address of operator), e.g.
Expand|Select|Wrap|Line Numbers
  1.   scanf("%f",&temperature);   // ** & added
  2.  
Jan 23 '07 #4
td0g03
64 New Member
when scanf() converts characters into a numeric value it has to return that value into the variable. To do this it need the address in memory of the variable. To pass the address you use the & (address of operator), e.g.
Expand|Select|Wrap|Line Numbers
  1.   scanf("%f",&temperature);   // ** & added
  2.  
Hello, I also had tried the & and I believe I got the error "Suggestion : You changed temperature, but did not read a value into it."

So would I have to put something like temperature = 10 is that "reading a value into it."
Jan 23 '07 #5
horace1
1,510 Recognized Expert Top Contributor
Hello, I also had tried the & and I believe I got the error "Suggestion : You changed temperature, but did not read a value into it."

So would I have to put something like temperature = 10 is that "reading a value into it."
try this program which reads a value from the keyboard and returns it into the variable temperature
Expand|Select|Wrap|Line Numbers
  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5.   float temperature; 
  6.   scanf("%f",&temperature);   // ** & added
  7.   printf("%f\n",temperature);
  8.   system("pause");
  9. }
  10.  
Jan 23 '07 #6
td0g03
64 New Member
try this program which reads a value from the keyboard and returns it into the variable temperature
Expand|Select|Wrap|Line Numbers
  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5.   float temperature; 
  6.   scanf("%f",&temperature);   // ** & added
  7.   printf("%f\n",temperature);
  8.   system("pause");
  9. }
  10.  

Hello, that works in my c++ program, but not for the website. I have to put

[code]
scanf("%f",&tem perature);
printf("%f\n",t emperature);
[code\]

You changed temperature, but did not read a value into it.
Unexpected identifiers: printf
Write a single statement, performing the input as directed.

The site asks
Write a statement that reads a floating point (real) value from standard input into temperature. Assume that temperature. has already been declared as an double variable.

I know scanf and printf does what the first line asks for, but could've the site have a grammar error or temperature. <<notice the period must be included in the code?

I'm sorry if this is confusing as I am confused as well.
Jan 23 '07 #7
horace1
1,510 Recognized Expert Top Contributor
what exactly are you trying do, i.e. what is the specification of the program? what website are you talking about?
Jan 23 '07 #8
td0g03
64 New Member
what exactly are you trying do, i.e. what is the specification of the program? what website are you talking about?
Hello, the website I am using is www.turingscraf t.com

You have some sort of instant message program I can send you my print screen of or I'll just find a website to host it.

Thanks again!
Jan 23 '07 #9
nareddyt
2 New Member
After a few hours of research, I figured out the correct code:

Expand|Select|Wrap|Line Numbers
  1. scanf("%lf",&temperature);
Dec 27 '11 #10

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