C Programming
What will be the output of the following program? #include\ int main(){  extern int i;  i = 20;  printf("%ld ", sizeof(i));  return 0; }

4
Linker Error : Undefined symbol 'i'
Depends on the Compiler
2

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C Programming
A preprocessor command

comes before the first executable statement
has # as the first character
need not start on a new line
need not start on the first column

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