foo.c:2:6: warning: return type of 'main' is not 'int' [-Wmain]
    2 | void main()
      |      ^~~~
foo.c: In function 'main':
foo.c:4:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    4 | {   int x,sum=0,p=1
      | ^
foo.c:14: error: expected '{' at end of input

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