Predict the output of this segment of program

a = 4;

b =3;

c = f1 ( a, b );

cout << "\n a = " << a << ", b = " << b << ", c = " << c;

c2 = f1 ( c, 2*c )

cout <<"\n c = " << c << ", c2 = " << c2;

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The function f1 is defined as:

float f1 ( float a, float b)

{ float d;

a = a * a;

b = b * b;

d = pow( a + b , 0.5 );

return ( d) ;

}