c - Is adding the newline character to printf() equivalent to flushing the stream? -


the following program shows how buffered i/o can cause problems in programs when errors 'divide zero' happen:

int main() {     int = 1, b = 0, c;      printf("dividing...");     c = a/b;      printf("answer is: %d\n", c);     return 0; }

the output floating point exception (core dumped).

fair enough. surprisingly, if changed first printf printf("dividing...\n");, text gets printed before program crashes (i'm running gcc on linux, way).

am conclude adding newline equivalent flushing? , if so, if printf() strings end in \n, i'm depriving myself of benefits of buffered i/o?

if standard output going terminal, yes, it's equal flushing, printf() use line-based buffering.

if it's redirected file, no. in case printf() uses bigger buffers, corresponding file system block sizes or whatever, optimize io.


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