Thread: getchar and putchar

halo all,
i've just started with K&R and got confused in this code.

Code:

#include<stdio.h>
#include<conio.h>
int main(void)
{
clrscr();
int c;
c=getchar();
while(c!=EOF)
{
putchar(c);
c=getchar();
}
getch();
return 0;
}

i dont understand how this program runs.for eg. if i give as input the string "i am new to c"(without double quotes) and then press enter the output it gives is "i am new to c" but what i think the output should be "i" because in my opinion the code first looks for an input ,then checks it against EOF and if the character is not EOF then it should print the first character and again repeats the process.
also if i run this code and give the same input(i am new to c) the output is what i expect i.e "i".

Code:

c=getchar();
putchar(c);

that's why i said it should repeat the process because of the while loop only

Because getchar() will "pull" keystrokes, if any are waiting in the keyboard buffer. You have a small string of char's waiting for it, so it pulls them, then prints them, one after the other.

The second example obviously can't do that, since it has no loop.

Want to see how big your keyboard buffer really is? See how big a string you can put into the string, before your mobo starts complaining.

Thanks adak you solved my confusion.thanks a lot.