java - loss of precision-->Required double but compiler required int? -

i beginner in java , faced error.

write method named pay accepts real number ta's salary , integer number of hours ta worked week, , returns how money pay ta. example, call pay(5.50, 6) should return 33.0.

the ta should receive "overtime" pay of 1 ½ normal salary hours above 8. example, call pay(4.00, 11) should return (4.00 * 8) + (6.00 * 3) or 50.0.

public double pay(double x,int y){     int sum=0;     double hours=8.0;     if(y>hours){        sum=(y-hours)*(1.5*x) + (hours*x);      }    return sum; } 

error:

you have mismatch between data types. occurs when try store real number (double) variable or parameter integer (int). possible loss of precision found   : double required: int        sum=(y-hours)*(1.5*x) + (hours*x);                              ^ 1 error 19 warnings 

but error pointing @ + sign.what wrong it? says found:double. want output double. said required int.

since sum int , you're returning sum in you're method, that's why error.

public double pay(double x,int y){     double sum=0;     double hours=8.0;     if(y>hours){        sum=(y-hours)*(1.5*x) + (hours*x);      }    return sum; } 

for second error, if take @ class math, pi() not exist, have call static variable of class math, should :

public double area(double x){     x=math.pi*math.pow(x,2);     return x;  }