Use of structs

please have following code

code: [select]


struct dhtreading
{
  float temp,humd;
  dhtreading(float t,float h)
  { temp = t; humd=h; }
};


struct sensorreadings
{
  dhtreading air1,air2;
  float water;
  sensorreadings(dhtreading a1,dhtreading a2,float w)
  { air1=a1;air2=a2;water=w;}
};


and getting following compilation error

code: [select]


tem.ino: in constructor 'sensorreadings::sensorreadings(dhtreading, dhtreading, float)':

rack_cooling_system:57: error: no matching function call 'dhtreading::dhtreading()'

   { air1=a1;air2=a2;water=w;}

   ^


how posting full program problem can seen in context ?

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