c - Why does fork() and printf() output more than I predict? -

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this little program:

#include <unistd.h> #include <stdio.h> int main() {   printf("1");   fork();   printf("2");   fork();   return 0; }

the output of code 12121212 , ask:
why print more 122?

because printf buffered , text printed when program exits. try flush stdout after each print.


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