Leading zeros input.... Convert problem in C.

Question

3.00/5 (1 vote)

See more:

Hi experts, I need to preserve any leading zeroes in the input so I took the digits in as char’s and then convert them back
to integers using the ctoi function (see below).

C++

#include<stdio.h>
#define ctoi(a)  a-'0'
int main()
{
    int n;
    char ch;
    scanf("%c",&n);
    ch=ctoi(n);

    printf("%c",n);

}

But the code didn't work. I'm not sure where is the problem.
Input:

Expected Output:

But I got:

What I have tried:

I tried the input (may have leading zeros) first convert into char and then again to integers.....

Posted 10-Apr-16 6:59am

Member 12378355we

Updated 10-Apr-16 8:31am

v5

Add a Solution

Comments

Patrice T 10-Apr-16 13:37pm

Define "code didn't work"

Member 12378355we 10-Apr-16 13:56pm

How? It should work.....

Patrice T 10-Apr-16 14:02pm

Tell what it do and what is the problem.
if wrong result, give and example with what it do and what you want.

Member 12378355we 10-Apr-16 14:09pm

Updated question. And included input and desired output

Patrice T 10-Apr-16 14:16pm

good

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)

Patrice T · Answer 1 · 2016-04-10T08:31:00

Obviously, your own code is like a blackbox to you. It don't do what you expect, and you don't understand why.
What follow is not directly a solution to your problem, but a key that will help you to understand by yourself what is wrong.
The debugger is your friend. It will show you what your code is really doing.
Follow the execution, inspect variables and you will see that there is a point where it stop doing what you expect.
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Debugger - Wikipedia, the free encyclopedia[^]

Your program is a mess, here is what your program is really doing

C++

#include<stdio.h>
#define ctoi(a)  a-'0'
int main()
{
    int n;
    char ch;
    scanf("%c",&n);
    ch=ctoi(n);
     printf("%c",n);
}

Only the debugger can tell you what really append in this code.
You really need to follow tutorials and examples programs.

By the way, it look like HomeWork. If you fail to solve the problem, it is a useful information for your teacher.
And showing your own work that fail is better than showing someone else work that you don't understand.