Thread: buffer issue

hi guys

I have a program where I read data char by char and store them into a buffer.Every byte I read I want to put it in the buffer so I do this:

Code:

char buf[128];
char c;
//read one char
buf+= c;

Is this correct?
Also when I meet a certain character I have to check the previous one.How can I achieve that?
Thanks in advance

No, you need a counter variable.
Modify something like this to include your check,

Code:

    char buf[11];
    int i=-1;
    buf[10]=0;
    while(++i!=10)
    {
        buf[i]=(char)getchar();
    }
    puts(buf);

Originally Posted by manasij7479

No, you need a counter variable.
Modify something like this to include your check,

Code:

    char buf[11];
    int i=-1;
    buf[10]=0;
    while(++i!=10)
    {
        buf[i]=(char)getchar();
    }
    puts(buf);

Originally Posted by manasij7479

No, you need a counter variable.
Modify something like this to include your check,

Code:

    char buf[11];
    int i=-1;
    buf[10]=0;
    while(++i!=10)
    {
        buf[i]=(char)getchar();
    }
    puts(buf);

thanks that was useful!
what if I want after printing the contents of the buffer to restore new stuff in there?
I can do:

Code:

i=-1

all over again,but maybe the second time the data will not fill the buffer,let's say the second time I only read 5 characters.
When I print them the 5 new ones will be print along with 5 old ones that were not copied..
So is there a way to "delete" things in the buffer and then restore new data safely?

Originally Posted by quo

thanks that was useful!
what if I want after printing the contents of the buffer to restore new stuff in there?
I can do:

Code:

i=-1

all over again,but maybe the second time the data will not fill the buffer,let's say the second time I only read 5 characters.
When I print them the 5 new ones will be print along with 5 old ones that were not copied..
So is there a way to "delete" things in the buffer and then restore new data safely?

Certainly there is a way to do this. As mentioned previously '\0' is the null terminating character that you should use to end EVER c-string. You can do this one of two ways. Either you can simply put a '\0' as the last character when you write the the string again or you can use the loop we showed you above and replace every character with a '\0'. Either option will work and I don't think one is better than the other except that the first method would be a little quicker.