#microsoft internship problem

	/*
	1) Given a string, you have to check if it is a valid number or not.(The number can be signed, floating point/integer).
	If it is a number return true else return false.
	The constraints were :-
	i) No decision statements allowed (No if-else,no switch-case).
	ii) No ternary conditional operators allowed (? : not allowed).
	iii) No looping statements allowed (No for/while/do-while).
	*/
	#include<iostream>
	using namespace std;
	bool dot=false;
	bool endt=false;
	bool finalr=true;
	bool isdot(char c)
	{
	return(c=='.'&&(!dot)&&(dot=true));
	}
	bool validno(char c)
	{
	return(c=='0'||c=='1'||c=='2'||c=='3'||c=='4'||c=='5'||c=='6'||c=='7'||c=='8'||c=='9');
	}
	bool rec(char *s)
	{
	endt=*s=='\0';
	bool thisis=endt||validno(*s)||isdot(*s);
	finalr=finalr&&thisis;
	bool ttm=(*s=='.')&&(*(s+1)=='\0')&&(finalr=false);
	s++;
	bool tm=(!endt)&&rec(s);
	return(finalr);
	}
	bool check(char s[])
	{
	dot=(s[0]=='.');
	bool frst=s[0]=='-'||s[0]=='+'||dot||validno(s[0]);
	bool tm=(*(s+1)=='\0')&&(*s=='.'||*s=='+'||*s=='-')&&(finalr=false);
	return(frst&&rec(&s[1]));
	}
	int main()
	{
	dot=false;
	endt=false;
	finalr=true;
	char s[1000];
	cin>>s;
	cout<<check(s);
	main();
	}

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