显示4个整数中最大和最小的，同时也显示它们的位置。

Question

这是我上大学的第一年参加Comp课程，在此之前我没有编程经验。我目前正在尝试为类赋值编写一个C程序，它接受4个整数输入，然后显示其中最大和最小的一个，同时还说明了输入最大和最小整数的位置。

注意到：我不允许使用任何函数、数组或循环(除了下面给出的while循环，但不再使用)。

我的教授提供了一个提纲来帮助开始。

这是我的密码：

#include <stdio.h>

int main(void)
{
    int x1, x2, x3, x4;
    int xlarge, xsmall, ixlarge, ixsmall;

    while (1)
    {
        printf("enter x1, x2, x3, x4:\n");
        scanf("%d%d%d%d", &x1, &x2, &x3, &x4);

        /*     add code to calculate xlarge, xsmall,
         *     ixlarge, ixsmall
         * --> between here */

        if ((x1 > x2) && (x1 > x3) && (x1 > x4))
            x1 = xlarge;
        else if ((x2 > x1) && (x2 > x3) && (x2 > x4))
            x2 = xlarge;
        else if ((x3 > x1) && (x3 > x2) && (x3 > x4))
            x3 = xlarge;
        else if ((x4 > x1) && (x4 > x2) && (x4 > x3))
            x4 = xlarge;

        if ((x1 < x2) && (x1 < x3) && (x1 < x4))
            x1 = xsmall;
        else if ((x2 < x1) && (x2 < x3) && (x2 < x4))
            x2 = xsmall;
        else if ((x3 < x1) && (x3 < x2) && (x3 < x4))
            x3 = xsmall;
        else if ((x4 < x1) && (x4 < x2) && (x4 < x3))
            x4 = xsmall;

        if (xlarge = x1)
            ixlarge = 1;
        else if (xlarge = x2)
            ixlarge = 2;
        else if (xlarge = x3)
            ixlarge = 3;
        else if (xlarge = x4)
            ixlarge = 4;

        if (xsmall = x1)
            ixsmall = 1;
        else if (xsmall = x2)
            ixsmall = 2;
        else if (xsmall = x3)
            ixsmall = 3;
        else if (xsmall = x4)
            ixsmall = 4;

        /* <-- and here */

        printf("largest = %4d at position %d, ", xlarge, ixlarge);
        printf("smallest = %4d at position %d\n", xsmall, ixsmall);
    }

    while (1) getchar();
    return 0;
}

据我所知，如果满足条件，这个程序应该将xlarge和xsmall分配给输入，ixlarge和ixsmall也是如此。但是，我在尝试运行程序时遇到的一个问题是，xlarge和xsmall显然没有初始化，我不知道从哪里开始。

Answer 1

查看代码：

它应该是xlarge = x1，而不是x1 = xlarge和类似的xsmall = x1，因为存储x1值的是xlarge，而不是相反。

你也可以把你的“如果-否则”像这样：

if ((x1 > x2) && (x1 > x3) && (x1 > x4))
{
xlarge = x1;
ixlarge = 1;
}
else if ((x2 > x1) && (x2 > x3) && (x2 > x4))
{
xlarge = x2;
ixlarge = 2;
}

等等..。

Answer 2

当你认为你的问题太难的时候

把你的问题分成小块或者简化你的问题。

1.获取i输入的(1整数)并显示它

2.获取i输入的内容(2个整数)并显示出来

3.比较我在(两个整数)中的键大小，并显示出来。

4.获取我在(3个整数)中键入的内容并显示出来，比较我在(3个整数)中的键(3个整数)，并显示它。

5.尝试4个整数

我想告诉你们的不是编程，而是学习方法。

1.

#include <stdio.h>
#include <stdlib.h>



int main() {
    int FirstKeyIn;
    scanf("%d",&FirstKeyIn);
    printf("I key in :%d \n",FirstKeyIn);



    return 0;
}

2.

#include <stdio.h>
#include <stdlib.h>



int main() {
    int FirstKeyIn,SecondKeyIn;
    scanf("%d %d",&FirstKeyIn,&SecondKeyIn);
    printf("First  key in :%d \n",FirstKeyIn);
    printf("Second key in :%d \n",SecondKeyIn);


    return 0;
}

3.

#include <stdio.h>
#include <stdlib.h>



int main() {
    int FirstKeyIn,SecondKeyIn;
    int Bigger,Smaller;
    scanf("%d %d",&FirstKeyIn,&SecondKeyIn);
    printf("First  key in :%d \n",FirstKeyIn);
    printf("Second key in :%d \n",SecondKeyIn);
    if(FirstKeyIn>SecondKeyIn){
        Bigger=FirstKeyIn;//save FirstKeyIn value into Bigger
        Smaller=SecondKeyIn;//save SecondKeyIn value into Smaller
    }else{
        Bigger=SecondKeyIn;//save SecondKeyIn value into Bigger
        Smaller=FirstKeyIn;//save FirstKeyIn value into Smaller
    }
    printf("Bigger value is :%d \n",Bigger);
    printf("Smaller value is :%d \n",Smaller);
    return 0;
}

4.

#include <stdio.h>
#include <stdlib.h>



int main() {
    int FirstKeyIn,SecondKeyIn,ThirdKeyIn;
    int Bigger,Smaller;
    scanf("%d %d %d",&FirstKeyIn,&SecondKeyIn,&ThirdKeyIn);
    printf("First  key in :%d \n",FirstKeyIn);
    printf("Second key in :%d \n",SecondKeyIn);
    printf("Third key in :%d \n",ThirdKeyIn);
    if(FirstKeyIn>SecondKeyIn){
        Bigger=FirstKeyIn;//save FirstKeyIn value into Bigger
        Smaller=SecondKeyIn;//save SecondKeyIn value into Smaller
    }else{
        Bigger=SecondKeyIn;//save SecondKeyIn value into Bigger
        Smaller=FirstKeyIn;//save FirstKeyIn value into Smaller
    }

    if(ThirdKeyIn>Bigger){
        Bigger=ThirdKeyIn;//save ThirdKeyIn value into Bigger
    }
    if(ThirdKeyIn<Smaller){
        Smaller=ThirdKeyIn;//save ThirdKeyIn value into Smaller
    }


    printf("Bigger value is :%d \n",Bigger);
    printf("Smaller value is :%d \n",Smaller);
    return 0;
}

用最大的，最小的地方

#include <stdio.h>
#include <stdlib.h>



int main() {
    int FirstKeyIn,SecondKeyIn,ThirdKeyIn;
    int Bigger,Smaller;
    int MaxPlace,MinPlace;
    scanf("%d %d %d",&FirstKeyIn,&SecondKeyIn,&ThirdKeyIn);
    printf("First  key in :%d \n",FirstKeyIn);
    printf("Second key in :%d \n",SecondKeyIn);
    printf("Third key in :%d \n",ThirdKeyIn);
    if(FirstKeyIn>SecondKeyIn){
        Bigger=FirstKeyIn;//save FirstKeyIn value into Bigger
        Smaller=SecondKeyIn;//save SecondKeyIn value into Smaller
        MaxPlace=1;
        MinPlace=2;
    }else{
        Bigger=SecondKeyIn;//save SecondKeyIn value into Bigger
        Smaller=FirstKeyIn;//save FirstKeyIn value into Smaller
        MaxPlace=2;
        MinPlace=1;
    }

    if(ThirdKeyIn>Bigger){
        Bigger=ThirdKeyIn;//save ThirdKeyIn value into Bigger
        MaxPlace=3;
    }
    if(ThirdKeyIn<Smaller){
        Smaller=ThirdKeyIn;//save ThirdKeyIn value into Smaller
        MinPlace=3;
    }


    printf("Bigger value is :%d \n",Bigger);
    printf("Bigger Place is :%d \n",MaxPlace);
    printf("Smaller value is :%d \n",Smaller);
    printf("Smaller Place is :%d \n",MinPlace);
    return 0;
}

5.

你自己试试看