reduce space char function question..

[transgalactic2]

i need to write a function which transforms 2 or more spaces into one
for example:
"gjkk jjj k" (for some reason it doesnt show my edit) it should be with much more spaces between

turns to
"gjkk jjj k"

i have this structure

void *(char *str)
{
    int i;
    for(i=0;str[i];i++)
         if(str[i]=='i')
                if (??1??||??2??||??3??)
                {
                    strcpy(??4??);
                    ??5??;
                 }
}

i need to substitute code instead of ??1?? for this function to work
i dont know why they use 3 or statements on this if??
i would do it by if the current cell is ' ' ans the next to then ..

and str copy makes of one string as the copy of abother
how to use it??

[Nightowl]

If you're trying to duplicate strings, then you have to be able to resize the string and insert characters. Let's see . . .

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

int main(int argc, char *argv[]) {
    char string[128] = "a b c d e f";
    size_t x, y;
    for(x = 0; string[x]; x ++) {
        if(string[x] == ' ') {
            for(y = strlen(string); y > x; y --) {
                string[y] = string[y-1];
            }
            string[x+1] = ' ';
    }
    printf("%s\n", string);
    return 0;
}

Or something like that. That may need to be strlen(string)-1, not sure.

[vart]

OP wants to get rid of spaces not insert them. I suppose

[transgalactic2]

yes i want to have only one space between two other chars

[Nightowl]

Ohhh, sorry. My bad. I misread the question.

Try something more like this, then.

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

int main(int argc, char *argv[]) {
    char string[128] = "a b c d e f";
    size_t x, y;
    for(x = 0; string[x]; x ++) {
        while(string[x] == ' ') {
            for(y = x; y < strlen(string); y ++) string[y] = string[y+1];
        }
    }
    printf("%s\n", string);
    return 0;
}

Easier, actually.

[transgalactic2]

i need it to be like in the structure i was given
i need to say
what did i put instead of each ??1?? stuff

??

[vart]

i need it to be like in the structure i was given
i need to say
what did i put instead of each ??1?? stuff

??

what this line

if(str[i]=='i')

has to do with searching for spaces?

[Nightowl]

What I gave you is how to reduce any amount of spaces (or any char you like) into no spaces. It is easy enough to modify to reduce to one single space.

Modifying it into the form you were given is not my problem. I don't understand exactly what you're asking for, but AFAICT, you've been given this as part of a homework problem, and your function has to meet the structure that you posted above.

[EVOEx]

I prefer something along the lines of:

char *s, *d;
s = d = str;
while(*s) {
  if(*s != ' ')
    *d++ = *s;
  s++;
}
*d = *s;

That's a lot faster than copying the rest of the string for every space.

[Nightowl]

True enough, EVOEx. Also harder to follow if you don't understand strings and pointers very well, however.

[transgalactic2]

what this line

if(str[i]=='i')

has to do with searching for spaces?

i dont know thats what ive been given

i need it to be like in the structure i was given
i need to say
what did i put instead of each ??1?? stuff

??

[vart]

i dont know thats what ive been given

I doubt it

[transgalactic2]

do doubt it
it write from an exam

[vart]

do doubt it
it write from an exam

you should reread it. Or you are missing reference to 'i' char in task description, or your code has a typo

[matsp]

Presumably if it's an old exam (and you are not CURRENTLY in an exam), you should be able to get the old answers too?

--
Mats