C Primer Plus note4, primerplusnote4

C Primer Plus note4, primerplusnote4

Warning: implicit declaration of function 'pirntf' [-Wimplicit-function-declaration] |

This warning is caused by the use of a function without declaration: a function that is implicitly declared. Take a closer look at the warning and find that the printf () function is accidentally written as pirntf, so be careful when coding.

It does not matter if an error occurs. The compiler will warn you. You only need to remember this warning and find the location where the error occurred. It will be corrected soon.