double sum=0 与double sum=0.0

double sum=0 与double sum=0.0 #includeusing namespace std;#define PI 314159double area(double radius=0);double area(double a,double b);double area(double a,double b,double h);double area(double a,double b,double c,int);int main(){cout sum += 1.0/(double) 在java中! operator=是什么意思啊# include double sum(double a,double b);double subtract(double a,double b);double divide(double a,double b);double multiply(double a,double b);main(){int choice;char operator;double a,b;double (*func)();printf( * * * * * 这个C++梯形法求定积分的函数为什么错了double tixing(double (*f)(double),double a,double b){int n=1000,i;double s,sum=0,d;d=(b-a)/n;double y1=(*f)(a+i*d);double y2=(*f)(a+i*d-d);for (i=1;i double* xyz_scale = 0; double double double double double double double double Double double double double