Thread: Remove Spaces?

How do I remove spaces from a sentence enter by the user?

say I have an array:

char sentence[40];

and the user inputs a value into sentence... say the user enters: "hello world world world"

how do I take that input, and convert it to "helloworldworldworld"?

That algorithm is quadratic, but it can be done in linear time. Think about it a bit more.

Do you need to remove the spaces and then do something to the remaining sentence, or are you simply trying to remove the spaces and print the line back out. If you are, you could simply set up a loop that goes through the each element of the char array one by one and prints it if it isn't a space.

Otherwise, you could remove the spaces when you read in the line. Like so.

Code:

int index = 0
char* input;
input = malloc(1);

while(index == 0)
 {
  scanf(&input[index]);
  if(input[index] == ' ')
    continue;
  else if(input[index] == '\n')
    break;
  input = realloc(input, index + 1);
  ++index;
 }

Code:

#include <stdio.h>
#include <ctype.h>

int main(void){
	int c;

	while ((c=getchar()) != EOF){
		if( !isspace(c))
			putchar(c);
	}
}

I don't quite understand the codes you guys gave.

This is the program that I am working on:

Code:

#include<stdio.h>
#include<string.h>

int main()
{
      char sentence[50];
      int count;
      int a;
      int b;

      printf("Enter A Sentence, The Computer Will Tell You Whether The Sentence Is A Palindrome Or Not!:\n");
      fgets(sentence,sizeof sentence, stdin);

         for(count=0;sentence[count]!='\0';count++);
         for(a=count-2,b=0;a>=0;b++,a--)
            {
               if(toupper(sentence[b])!=toupper(sentence[a]))
                  {
                     printf("This Is Not A Palindrome!");
                     getchar();
                     return 0;
                   }
             }

printf("This Is A Palindrome!");
getchar();


return 0;
}

It's a program that tells the user is a word entered is a palindrome or not. For you thats not familiar with a palindrome, its a word(s) that are the same when they are read forward or backwards. ex: straw warts, racecar, damn i agassi miss again mad ...etc...

It works fine for words like: straw warts

but it does not work for something like: race car

both words are palindrome, but it will not detect "race car" as palindrome unless the word is entered without a space (racecar).

How would I modify it so the program will automatically remove all spaces from the entered words?

Originally Posted by Pressure

Code:

#include <stdio.h>
#include <ctype.h>

int main(void){
	int c;

	while ((c=getchar()) != EOF){
		if( !isspace(c))
			putchar(c);
	}
}

this is the loop that I want to use. How would I make it so that instead of each character being printed out in the screen, the computer stores it in an array?

Code:

an_array[i] = c;
++i;

Put that in the loop, but make sure you have enough room in your array.

Originally Posted by joshdick

Code:

an_array[i] = c;
++i;

Put that in the loop, but make sure you have enough room in your array.

what does the "i" stand for??