failed build for my project

Question

A message of (control may reach end of non-void function) why?

here Is my code :

int search(book x[], int size , string name){
for(int=0 ; i<size ; i++)
if(name.compare(x[i].nameOfbook)==0)
return i;
}

Answer 1

What if the if block never true.. For that You shloud add return statement as last statement
return -1; //for search unsuccessful....

So correct code:

int search(book x[], int size , string name){
for(int=0 ; i<size ; i++)
if(name.compare(x[i].nameOfbook)==0)
return i;
return -1;
}