模板 int f(int x,inty ireturn(x+y;y double f(double x, double return(x+yi] float f(float x float y return(x+y;] 数学抽象: T add(tx t yi return x+yi y模板 int f(int x,int y) {return (x+y);} double f(double x, double y) {return (x+y);} float f(float x, float y) {return (x+y);} 数学抽象： T add(T x, T y) { return x+y; }