error string and char..

Question

1.00/5 (2 votes)

See more:

C++

#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
	float c,f;
	printf("plesase write a number of degrees celsius:");
	scanf("%f",&c);
	f=c*9/5+32;
	printf("number of degree fahrenheit: %f\n",f);
	system("pause");
	return 0;
}

Output is the number.Its input is the number.
If the input string, the output is not suitable for, say, if the input string, the output of our cout<<"error";
With cin and cout What is it?

Posted 23-Feb-12 22:20pm

sajad abbasi

Updated 23-Feb-12 23:47pm

v7

Add a Solution

Comments

nagendrathecoder 24-Feb-12 4:23am

Your question is not clear. Can you explain it more?

Sarvesh Kumar Gupta 24-Feb-12 4:26am

Pls describe your problem in detail. More clear

sajad abbasi 24-Feb-12 4:31am

It was good؟

Mohibur Rashid 24-Feb-12 4:43am

Its nearly impossible to help you

sajad abbasi 24-Feb-12 4:47am

What you mean?

OriginalGriff 24-Feb-12 4:49am

Please try using the "Reply" feature of each post - it means an email is sent to the relevant person. Like this one did.
Just adding a new comment does not do that.

OriginalGriff 24-Feb-12 4:48am

Sorry - it's probably a language thing.
Try editing your question again, and giving an example. At the moment we still can't tell what you are trying to do, let alone what problem you are having with it.

sajad abbasi 24-Feb-12 5:13am

Thank you

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2012-02-23T23:08:00

Solution 1

Try this:

C#

int main(int argc, char *argv[])
    {
    float c,f;
    printf("plesase write a number of degrees celsius:");
    if (scanf("%f",&c) != 1)
       {
       printf("Error\n");
       }
    else
       {
       f=c*9/5+32;
       printf("number of degree fahrenheit: %f\n",f);
       }
    system("PAUSE");
    return 0;
    }

Posted 23-Feb-12 23:08pm

OriginalGriff

Comments

sajad abbasi 24-Feb-12 5:33am

With cin and cout What is it?

OriginalGriff 24-Feb-12 6:04am

float c,f;
cout << "plesase write a number of degrees celsius:";
try
{
cin >> c;
f=c*9/5+32;
cout << "number of degree fahrenheit: " << f << "\n";
}
catch (const char* Str)
{
cout << "Error\n";
}

sajad abbasi 24-Feb-12 6:17am

Does not work

OriginalGriff 24-Feb-12 7:03am

Not too helpful - what "doesn't work"?

sajad abbasi 24-Feb-12 7:07am

float c,f; cout << "plesase write a number of degrees celsius:"; try { cin >> c; f=c*9/5+32; cout << "number of degree fahrenheit: " << f << "\n"; } catch (const char* Str) { cout << "Error\n"; }
It does not work. Does not run the previous program it runs.

sajad abbasi 24-Feb-12 7:14am

#include <iostream>
#include<string>
using namespace std;
int main()
{
cout<<"write numbers:\n";
float a=0,b=0,i=0;
if(a!=-999)
{
while(a!=-999)
{
i++;
cout<<"number"<<i<<":";
cin>>a;
b=b+a;
}
}
cout<<"sum="<<b<<"\n";
return 0;
}
This one time, like the previous fix it. Thank

OriginalGriff 24-Feb-12 7:17am

Sorry - I forgot the cin doesn't throw errors - it returns a success / fail value.
Try this:
float c,f;
cout << "plesase write a number of degrees celsius:";
if ((cin >> c))
{
f=c*9/5+32;
cout << "number of degree fahrenheit: " << f << "\n";
}
else
{
cout << "Error\n";
}

sajad abbasi 24-Feb-12 7:23am

thank you

sajad abbasi 24-Feb-12 6:41am

Please answer this

sajad abbasi 24-Feb-12 5:37am

if (scanf("%f",&c) != 1)
What does that mean?

OriginalGriff 24-Feb-12 5:53am

scanf is a companion to printf - it reads a line and converts it to the datatype as specified by the format string - you used it in your example. It returns a number which is the number of items successfully converted. In your case, you want a single number, so any value other than 1 means the user entered the wrong data.