osx - Error when trying to compile C program code in C99 mode -

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when i'm compiling simple program 'hello world', i'm getting warning @ printf function. here error message:

hey.c:4:5: warning: implicit declaration of function 'puts' invalid in c99   [-wimplicit-function-declaration] puts("hello world!"); ^ 1 warning generated. ld: can't write output file: a.out architecture x86_64 clang: error: linker command failed exit code 1 (use -v see invocation)

yes need include stdio.h in code . compilers allow use printf without header file generate warning


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