solution to the problem

i want to replace the tab with \t , space with \s and back slash with
\\, from input to output.
i wrote the program like below. so tell me some one why it is wrong...

Code:

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main()
{
      int c;
     
      while((c = getchar()) != EOF) {
              if(c == ' ')
                    printf("\\s");
              else if(c == '\t')
                      printf("\\t");
                else if(c == '\')
                      printf("\\\\");
              else
                      putchar(c);
        }
}

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You want to replace

Quote:

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space with \s

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and your code does:

Code:

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              if(c == ' ')
                    printf("\\b");

---

Does that seem right?

Quote:

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so tell me some one why it is wrong

---

It would of course help if you on your side explained "How it is different from what you expect", since we can only guess on what is not working....

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Mats

no im sorry... but thats not what im asking. its giving errors that ' missing, } missing. so i want to know whether what i have written is write or wrong. if it is wrong then where i have done mistake....

Have a look at this line, then:

Code:

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else if(c == '\')

---

What does it actually produce?

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Mats

my intention of writing that line is if i give \ as input then that character is compared with \... isn't???

Except that the backslash is the escape character, so you are actually escaping a single quote, which is obviously not what you want...;)

Quote:

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Originally Posted by vapanchamukhi

my intention of writing that line is if i give \ as input then that character is compared with \... isn't???

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mmm, yes. But the compiler will want to interpret things for you. It's uselessly clever like that ;) It thinks you're trying to escape the second ' and hence you don't have a closing apostrophe. I think all you need is to compare c with '\\'.

QuantumPete

ya now 0 errors.. i compiled successfully. but now it is not giving any thing as output..

Quote:

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Originally Posted by vapanchamukhi

ya now 0 errors.. i compiled successfully. but now it is not giving any thing as output..

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That is very strange, as I would expect it to at least output back what you have input after you hit enter. In fact, it works just like I expect when I run it here.

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Mats

post your code again, maybe another error crept in somewhere.

QuantumPete

ya it works fine... i had done mistake while writing that program in vim editor... instead of assigning the value of getchar() i had used ==... thats because of that it was not showing any thing.... now it works fine...

That means you're not compiling with any of the warning flags. You should always include -Wall in your gcc commandline. That should have flagged up this problem as a warning.

QuantumPete

ya actually i used to compile using cc not gcc. is there any such option in cc..

Quote:

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Originally Posted by vapanchamukhi

ya actually i used to compile using cc not gcc. is there any such option in cc..

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What OS are you using? If it's Linux, then cc == gcc. Otherwise, we'd need to know what compiler it is...

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Mats

ok thanks... i dint know that... i work in fedora linux.