Question

我正在学习编程，你能帮助我并告诉我出了什么问题吗？程序应识别最小值，中间值和最大值，并按顺序将其分配给d1，d2，d3

void three_function(double * pnt_d1, double * pnt_d2, double * pnt_d3){

    double smallest, middle, largest;
    largest = *pnt_d1;
    smallest = *pnt_d2;
    middle = *pnt_d3;

    if (*pnt_d2 > largest)
        largest = *pnt_d2;

    else if (*pnt_d3 > largest)
        largest = *pnt_d3;

    else if (*pnt_d1 < smallest)
        smallest = *pnt_d1;

    else if (*pnt_d3 < smallest)
        smallest = *pnt_d3;

    else if ((*pnt_d1 > smallest) && (*pnt_d1 < largest))
        middle = *pnt_d1;

    else if((*pnt_d2 > smallest) && (*pnt_d2 < largest))
        middle = *pnt_d2;

    *pnt_d1 = smallest;
    *pnt_d2 = middle;
    *pnt_d3 = largest;

}

执行不力：

Please enter 3 double values: 1 2 3

（开始时）现在d1 = 1.000000，d2 = 2.000000，d3 = 3.000000

（三功能后）现在d1 = 2.000000，d2 = 3.000000，d3 = 2.000000

Answer 1

基本上，如果以下if成功，则不会执行任何其他语句，因为它们位于else if中。因此，您要删除所有else，只需检查if(condition) 6次。像

这样的东西

if (*pnt_d2 > largest)
    largest = *pnt_d2;

if (*pnt_d3 > largest)
    largest = *pnt_d3;

 ....

Answer 2

问题在于：

if (*pnt_d2 > largest) // 2 > 1
    largest = *pnt_d2; // largest = 2
else if...

由于else if代码跳转：

*pnt_d1 = smallest; // not changed and equal to 2
*pnt_d2 = middle;   // not changed and equal to 3
*pnt_d3 = largest;  // updated by 'if' and equal to 2

认识到最小，中等和最大的价值

2 个答案: