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  1. #include <stdio.h>
  2. int main(void)
  3. {
  4.     void foo(void);
  5.     //...
  6. }
  7. void test(void)
  8. {
  9.     foo();
  10. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.c: In function ‘test’:
prog.c:9:5: warning: implicit declaration of function ‘foo’ [-Wimplicit-function-declaration]
     foo();
     ^~~
prog.c:4:10: note: previous declaration of ‘foo’ was here
     void foo(void);
          ^~~
prog.c:9:5: error: incompatible implicit declaration of function ‘foo’
     foo();
     ^~~
prog.c:4:10: note: previous implicit declaration of ‘foo’ was here
     void foo(void);
          ^~~
stdout
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Standard output is empty
https://ideone.com/QASYNo
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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