io - fastest way to print new line in std out in C language? -

so solving questions on codechef(programming competition platform) , specific question has lot of i/o every result printed in new line on console. without printing results in new line program execution takes .3 seconds new line taking around 1.3 seconds 1 second being limit program execution.

my question is possible print new line on console faster??

i using putchar_unlocked , using custom function output specified below. compiler gcc 4.8.1

#define pc(x) putchar_unlocked(x); inline void writeint (int n) {     int n = n, rev, count = 0;     rev = n;     if (n == 0) {       pc('0');        pc('\n');        return;     }     while ((rev % 10) == 0) {       count++;       rev /= 10;       //obtain count of number of 0s     }     rev = 0;     while (n != 0) {        rev = (rev<<3) + (rev<<1) + n % 10;       n /= 10;       //store reverse of n in rev     }       while (rev != 0) {       pc(rev % 10 + '0');        rev /= 10;     }     while (count--) pc('0');     pc('\n'); //this line prints new line , reason 1 second delay! } 

by default stdout line-buffered. means system call write invoked if there newline in buffer.

change stdout buffering buffered:

setvbuf(stdout, null, _iofbf, 0); 

and flush output @ end:

fflush(stdout);