foo.c: In function 'MergeArr':
foo.c:4:2: error: parameter 'i' is initialized
  int i=0,j=0,h=0;
  ^~~
foo.c:4:2: error: parameter 'j' is initialized
foo.c:4:2: error: parameter 'h' is initialized
foo.c:5:2: error: expected declaration specifiers before 'while'
  while(i<arr1_len&&j<arr2_len)
  ^~~~~
foo.c:21:2: error: expected declaration specifiers before 'if'
  if(i>=arr1_len)
  ^~
foo.c:30:2: error: expected declaration specifiers before 'else'
  else
  ^~~~
foo.c:39:1: error: expected declaration specifiers before '}' token
 }
 ^
foo.c:42:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
foo.c:52:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
foo.c:2:6: error: old-style parameter declarations in prototyped function definition
 void MergeArr(int* arr1,int arr1_len,int* arr2,int arr2_len,int* arr3)
      ^~~~~~~~
foo.c:65:1: error: expected '{' at end of input
 }
 ^

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