reverse a string with recursive function it is to be terminated by space not by enter

[anand vishwakar]

Hi all,

I prepared a program in c language to reverse a string using recursive function

In my program I terminated the string using new line character '\n'

But I want to change my program in the way that if a white space is pressed after typing a word then space bar ' ' should be used to terminate the string and string should be printed in reverse order

but when I used statement

if((ch=getchar())!=' ')
rev();

then string is not being terminated after executing the program

here is the coding I used to apply my logic

void rev(void)
{
char ch;

if((ch=getchar())!='\n')
{
rev();
printf("%c",ch);
}
}

please guide me about the solution to this problem

Thank you

[weaknessforcats]

Well, you don't really have a string here. What you have is one character at each level of recursion.

To reverse a string, the easiest thing to do is swap the first and last characters of the string.

So in thiscase you call rev() with the address of the first and last character. When rev() calls rev() is does no by passing the addresses of the next character from the left and the previous character on the right.

rev() returns when the ttwo addressws ae equal.

And your string is reversed.
Now just display it in main().

You don't actually need delimiters. All you need is the address of the first and last character in the range of characters thest need reversing.

[anand vishwakar]

thank you for your valuable help
and I have also found a mistake in my logic to reverse a resies of entered characters actually I should have used getche() function in place of getch() then my logic is working . Thank You