double calculateArea(double width, double height, [bool isTriangle]) {
double area;
if (isTriangle) {
area = width * height / 2;
} else {
area = width * height;
}
return area;
}
void mian() {
double result = calculateArea(12, 5, false);
print('The result for a rectangle is' + result.toString());
result = calculateArea(12, 5, true);
print('The result for a rectangle is' + result.toString());
}
却找不到原因
我放了一个?在 Bool
前面发错了,怎么删除问题?