Printf between two different for loops not working

Question

I am trying to debug using printf. I have inserted it between for loops, but I do not receive the output of it. I am certain that the algorithm is continuing after it and arriving to the end, it's like the reader is ignoring it.

Here's the code :

for (i = 0; i < lower; ++i) {
    buf3[i] = (buf[i] + buf2[i] )/2;
    printf("\n %d",buf3[i]);
}
printf("hiiiiiiiiiiiiiiiiiiii %d",i);

for (i; i < upper; ++i) {
    if (upper == num2) {
        buf3[i] += buf2[i]/2;
        printf("\n %d",buf3[i]);

    }
    else {
        buf3[i] += buf[i]/2;
        printf("\n %d",buf3[i]);

    }
}


printf("\n %d",upper);

The "hiiiii..." message is the one not being seen on the screen. (I tried replacing it by many other messages such as int or anything else, but in vain. I also tried to put another printf right above the first for loop, again it returned nothing).

Please note that upper and lower aren't huge numbers.

Thanks in advance.

Possible duplicate of [Why does printf not work before infinite loop?](http://stackoverflow.com/questions/7508630/why-does-printf-not-work-before-infinite-loop) — n. 'pronouns' m., Jul 08 '16 at 13:21
Sorry to tell you but i don't have an infinite loop there .. — Hanoun Fouad, Jul 08 '16 at 13:37

score 3 · Accepted Answer · answered Jul 08 '16 at 12:53

3

The printf in question does not print a newline, so the output is buffered until a later printf prints a newline.

Add the newline, and you should see the output:

printf("hiiiiiiiiiiiiiiiiiiii %d\n",i);

answered Jul 08 '16 at 12:53

dbush

162,826
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167
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score 0 · Answer 2 · answered Jul 08 '16 at 12:52

0

Try adding \n after %d.
Also i is not initialised in the second loop

answered Jul 08 '16 at 12:52

cp2014

21
2

It doesn't get deleted after exiting for loop so it is 'initialized'. As for the new line, thank you. – Hanoun Fouad Jul 08 '16 at 12:59

Printf between two different for loops not working

2 Answers2