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[C language] do you really know printf? (printf is typically error prone, and collection is strongly recommended)

2022-07-26 07:19:00 【rookieﻬ°】

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What is? printf（）？
Go straight to the topic ,printf The fallibility of

What is? printf（）？

What we know printf Is to print out characters , Figures, etc. , But you know printf What is the return type of ？
after cplusplus.com Query for , hear printf The return type of is int type , The returned value is the total number of characters written .

Go straight to the topic ,printf The fallibility of

printf("%d ",printf("%d",printf("%d",43)));

Do you know the result of this statement ？
Think about it ~~~
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Actually , The print result of the above statement is ：4 3 2 1

Why? ？
because , From the inside out printf("%d ",43) Print is 43, Is that right ？
then , Because a total of two characters are written （43）, So the one above printf("%d ",43) The return value of is 2;
Give it to the next printf Print , Print out 2;
then , Print 2 A total of 1 Characters , therefore printf("%d",2); The return value of is 1;
Return value 1 By the last one printf（）; Print , End of sentence ;
Do you understand ？