While printing "Hello world", if this error 'Hello' undeclared occurred that means Hello is supplied to the compiler as a variable not as a text/string.

在打印“ Hello world”時 ，如果發(fā)生未聲明的錯誤“ Hello” ，則意味著Hello是作為變量而不是text / string提供給編譯器的 。

This is possible only, when starting double quote is missing inside the printf(). To fix this error, you should take care of double quotes; place the constant string/text in double quotes.

僅當(dāng)在printf()中缺少雙引號時這才可能。 要解決此錯誤，您應(yīng)該注意雙引號。 將常量字符串/文本放在雙引號中。

Example:

例：

#include <stdio.h>int main(void) {//closing double quote is missing printf(Hello world");return 0; }

Output

輸出量

prog.c: In function ‘main’: prog.c:4:9: error: ‘Hello’ undeclared (first use in this function)printf(Hello world");^~~~~ prog.c:4:9: note: each undeclared identifier is reported only once for each function it appears in prog.c:4:15: error: expected ‘)’ before ‘world’printf(Hello world");^~~~~ prog.c:4:20: warning: missing terminating " characterprintf(Hello world");^ prog.c:4:20: error: missing terminating " characterprintf(Hello world");^~~ prog.c:6:1: error: expected ‘;’ before ‘}’ token}^

What happens, if we use single quote instead of double code in starting of the text/string?

如果我們在文本/字符串的開頭使用單引號而不是雙代碼會怎樣？

Missing terminating ' character error will be thrown.

缺少終止字符錯誤將被拋出。

How to fix?

怎么修？

To fix this error, close the text/string/Hello within the double quotes.

要解決此錯誤，請關(guān)閉雙引號內(nèi)的text / string / Hello。

Correct code:

正確的代碼：

#include <stdio.h>int main(void) {//closing double quote is missing printf("Hello world");return 0; }

Output

輸出量

Hello world

翻譯自: https://www.includehelp.com/c-programs/hello-or-text-undeclared-while-printing-hello-world-using-printf-error-in-c.aspx

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