About the problem of abnormal C printing

About c Print abnormal problems

Sometimes I make a mistake , You need to rely on printing to adjust and see the specific error location . But when printing is not enough, it will appear Being misled The situation of .
Let's not talk about other logic , We must first ensure that the logic of printing is correct .
First , Get to know printf This function
It is a line buffer function , When you execute this function , The data will not be printed immediately . But wait printf Buffer full for 1024 Bytes will be printed .
resolvent ：
First of all ： call Function to flush buffer

printf("hello c11");
fflush(stdout);

second ： Add ‘\r’, '\n’ when , The buffer will also be flushed immediately

printf("hello c22\r");
printf("hello c33\n");

Reference article ：C++ Explain in detail print Buffer refresh