Recurrent harmonic function returns NAN

#include 

float harmonic(float n, float har ) {

 if(n==0) {
 return 0;
 }

 if(n==1) {
 printf("%f
", har+1.0f);***/* This prints value 1.5000*/***
 return har+1.0f;
 }else{
 harmonic(n-1, (har+(1/n)));
} 
} 

int main() 
{ 
 printf(" %f
", harmonic(2, 0.0f)); **/* But this prints value nan(Not a Number)*/** 
 return 0; 
}

return harmonic(n-1, (har+(1/n)));

I wrote the following example Code to find the harmonic value of N (1 1/2 1/3… 1 / N). Read the comments in the code written with BOLD and help me find why this happens.

#include 

float harmonic(float n, float har) {

 if(n==0) {
 return 0;
 }

 if(n==1) {
 printf("%f
", har+1.0f);***/* This prints value 1.5000*/*** 
 return har+1.0f;
 }else{
 harmonic(n-1, (har+(1/n)));
} 
} 

int main() 
{ 
 printf("%f
", harmonic(2, 0.0f)); **/* But this prints value nan(Not a Number) */** 
 return 0; 
}

Thank you,
Naga

I want You want to do:

return harmonic(n-1, (har+(1/n)));

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