单项选择题

编写求两个双精度数之和的函数,选项中正确的是
A.double add(double a,double b)
{double s;
s=a+b;
return s; }
B.double add(double a,b)
{double s;
s=a+b;
return (s);}
C.double add(double a double b)
{double s;
s=a+b;
returns;}
D.double add(a,b)
{double a,b,s;
s=a+b;
return (s);}

A.double
B.double
C.double
D.double
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