c programme.. how to delete spaces between two words.

Question

how to delete space between two words using c programme... should I use ascii or just compair with ''?

eg. Input- "Hello World" Output-"HelloWorld".

Thanks, Vikram

Answer 1

Since you know you're only deleting characters and never inserting any, you can process a string in place with one traversal:

void remove_spaces(char* s) {
  assert(s); // precondition: s is a non-null pointer
  char* output = s;
  for (; *s; ++s) { // *s is false when *s == '\0'
    if (*s != ' ') { // if you want any whitespace, use !isspace(*s)
      *output++ = *s;
    }
  }
  *output = '\0';
}

Notice how output starts at s, so if there are no characters to remove, we write over each char with the same value. If there are spaces, however, s advances while output does not. Finally a null character is written to mark the end of the string.

int main() {
  char input[] = "Hello, world!"; // make sure to use a writable buffer
  remove_spaces(input);
  puts(input);
  return 0;
}

"Using ASCII or comparing" indicates some confusion. You should use ' ' instead of 32, even if you know they are equivalent on your system, for reasons of clarity.