库文件stdlib.h和stdio.h不支持utoa（）和snprintf（）

有时，当升级到MPLAB X IDE（如V4.01）或更改编译器的新版本时，我会松动UToA.（）和SNPRETCF（）的功能。有时，他们工作，有时他们不这样。我得到的错误是：./SRC/Audio.C:30:9:警告：函数的隐式声明“UTOA”…/SRC/AUME.C：在函数“DePasyA2DouLyOnO.LCDX这里”：./SRC/Auth.C:330:9:警告：函数的隐式声明“SNPrTrf'”似乎没有押韵或理由。对它来说。只有一天，他们工作。第二天，我得到上面的错误。我在开始时总是有这一点，包括：lt:ldlb.h & gt；*包含& ltsdio.h & gt；但是函数只是把错误抛在上面。但并非总是如此。我想我需要知道STDLIB。h和STDIO。h实际上是如何加载到项目中的，以及从何处来的。什么是对标准的内置库文件进行更改，这些文件会导致上面的错误。什么改变了，有人知道吗？



      以下为原文

    Sometimes when upgrading to a new version of MPLAB X IDE  (eg V4.01) or changing compilers, I loose the functionality of utoa() and snprintf().   Sometimes they work, sometimes they don't.  I get the errors like-

./src/user.c:302:9: warning: implicit declaration of function 'utoa'
../src/user.c: In function 'display_a_double_on_LCD_here':
../src/user.c:330:9: warning: implicit declaration of function 'snprintf'

There seems to be no rhyme or reason to it. Just one day they work. The next day, I get the errors above.
I always have this at the start-
#include
#include
But the functions just throw the error above.   But not always.
I think I need to work out how the  stdlib.h  and stdio.h are actually loaded into the project and where from.
What is making the change to the standard inbuilt library files that throws the error above.
How could a library file include a function like utoa() one day and the next day it doesn't.
What's changing, anyone know?

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