Solution [Error] 'for' loop initial declarations are only allowed in C99 or C11 mode Dev ++

Hi, gens .. if you encounter an error like [Error] 'for' loop initial declarations are only allowed in C99 or C11 mode. It's not because you wrote the for loop structure in C language wrong.
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To be able to run it is enough to add this code -std = c99 in the tools-compiler options menu. for more details, please see the video above.
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do not understand ??
please comment below, God willing, I will answer your questions
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Error c1189 ; c99 macro error, mazda 6 error c1119.
configure error no c99 compiler was found error c1105 cannot call a non-function.
error c99 xcode, error c1189 mfc bosch error code c11.
aeg lavamat error code c11.
error c1107 _ c99 error c, error c9999 error c11; error c99 designator outside aggregate initializer エラー 1 error c1189.
error c99c pace, error c99 mode. error c99 mode c99 error code blocks. error c1190.
c99 error handling C99 afx.h error c1189.
error c1189 windows.h already included error c99 mode error must compile with c99 error handling, error c99 error 1 fatal error c1189; error c99 mode.
error c99 xcode electrolux error c11, error c99-compliant compiler is required, error code c11; tivo error c11, error c1183 error c 991, .
error c9932e.