Rate of printing

[fkheng]

We use printf to display output onto the screen. Is it possible to decrease the rate of displaying hte output onto the screen?

[Prelude]

What do you mean by 'rate'?

[fkheng]

by rate i mean er.........
for example,

printf("I am just testing.");

Instead oif printing the whole text at once, is it possible to print I, followed by the space, followed by 'a' followed by 'm', and so forth at a controlled pace? Just to make it look cool? To simulate that the text is being typed out?

[AProg]

Yeah, it will look very cool....

[Prelude]

>To simulate that the text is being typed out?
Yes, use whatever delay function your compiler supports after you print each character:

#include <stdio.h>
#include <time.h>

/* For a portable EXAMPLE only! Don't use this function in a real program */
void delay(long s)
{
    clock_t end = clock() + (clock_t)s;

    while (clock() < end)
        ;
}

int main(void)
{
    char *p = "I am just testing.";
    char *t = p;

    while (*t)
    {
        printf("%c", *t++);
        fflush(stdout);
        delay(200);
    }

    printf("\n");

    return 0;
}

[fkheng]

er......wat do u mean by "do not use this function in a real program"?

while (*t) actually goes thru each character of the statement?

wat is fflush(stdout) for?

and wat is the purpose of the while loop? while (clock() < end)

[Prelude]

>wat do u mean by "do not use this function in a real program"?
Just what I said, don't use it. In a multitasking environment, that function is very nasty because it doesn't allow anything else to do anything while it performs its busy wait.

>while (*t) actually goes thru each character of the statement?
No, while (*t) specifies that the loop will end when the nul terminator is reached, the test is implicit as while (*t != 0).

>wat is fflush(stdout) for?
It makes sure that the output buffer is flushed so that you can actually see the typing effect.

>and wat is the purpose of the while loop? while (clock() < end)
It's a busy wait, like the following except more predictable:

int i;

for (i = 0; i < 10000000; i++)
    ;

p.s. It's spelled w.h.a.t.

[TeQno]

Do they speak english in what?

[sorry pulp fiction addict]