[Solved] why the following code gives the first mobile no. irrespective of name

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You cannot compare strings using = (or even by ==, for that matter) operator. You need to use strcmp() for that.

In your code, inside mobileno() function,

if( s="katrina" )

is essentially trying to assign the base address of the string literal "katrina" to s. It is nowhere near a comparison.

That said,

  1. Never use gets(), it suffer from buffer overflow problem. Use the safer alternative, fgets()
  2. Recommended signature of main() is int main(void)

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solved why the following code gives the first mobile no. irrespective of name