C语言 C 显示输入的最高和最低数字的程序。编程初学者
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C Program to display the highest and lowest entered numbers. Programming Beginner
提问by aawhite
I'm taking a C programming class this semester and I have absolutely no programming experience, this is making it extremely difficult for me to do the assignments or even study.
这学期我正在上 C 编程课，我完全没有编程经验，这使得我做作业甚至学习都非常困难。
the assignment is to write a program that will allow the user to input any amount of values and display the largest and smallest values that were inputted.
任务是编写一个程序，允许用户输入任意数量的值并显示输入的最大值和最小值。
it has to accept positive and negative number and entering 0 will terminate the program.
它必须接受正负数，输入 0 将终止程序。
if the first number entered is 0 then a message stating this must be displayed.
如果输入的第一个数字是 0，则必须显示一条消息说明这一点。
this may be quite laughable to some of you, but here is what I have.
这对你们中的一些人来说可能很可笑，但这是我所拥有的。
#include <stdio.h>
int main(void)
{
float max=0, a;
float min=0, b;
printf("Entering 0 will terminate the sequence of input values.\n");
do{ printf("Enter Number:");
if (scanf(" %f", &a)==1);{
if(a<max){
a=max;}
if(a>min){
a=min;}
}
} while(a!=0);
printf("Your largest number was %.3f. Your smallest number was %.3f.", max, min);
return 0;
}
also, can any of you recommend and reference materials that will help me learn this stuff, thank you.
另外，大家能不能推荐一下可以帮助我学习这些东西的参考资料，谢谢。
回答by wizard23
should be:
应该：
if(a > max) {
max = a;
}
if(a < min) {
min = a;
}
回答by herohuyongtao
It should work if you fix the following issues.
如果您解决以下问题，它应该可以工作。
You need to change
if (scanf(" %f", &a)==1);{ ^ ^to
if (scanf("%f", &a)==1){Forwhile(a!=0); ^^^It's a bad practice to compare
floatusing!=. Better to use the following insteadwhile(fabs(a) > 0.001);.As commented by @JonathanLeffler, actually it will be OK for this case. But in general, you certainly need to be careful about whether it is appropriate to compare two floating point values for equality, especially after a computation
Your logic is wrong, you should update
max/mininstead ofa. So changeif(a > max) { a = max; } if(a < min) { a = min; }to
if ( fabs(a) < 0.001 ) // if a~0, stop evaluating //, otherwise, you will always get 0 as the min break; if(a > max) { max = a; } if(a < min) { min = a; }You should initialize
minto be a very large number (e.g.FLT_MAX) at first to make it able to update based ona < min. And you'd better setfloat max=FLT_MINif you want to handle negative numbers.
你需要改变
if (scanf(" %f", &a)==1);{ ^ ^到
if (scanf("%f", &a)==1){为了while(a!=0); ^^^这是一个不好的做法，比较
float使用!=。最好使用以下代替while(fabs(a) > 0.001);.正如@JonathanLeffler 所评论的，实际上这种情况是可以的。但总的来说，您当然需要小心比较两个浮点值是否相等，尤其是在计算之后
你的逻辑是错误的，你应该更新
max/min而不是a. 所以改变if(a > max) { a = max; } if(a < min) { a = min; }到
if ( fabs(a) < 0.001 ) // if a~0, stop evaluating //, otherwise, you will always get 0 as the min break; if(a > max) { max = a; } if(a < min) { min = a; }您应该首先初始化
min为一个非常大的数字（例如FLT_MAX），以使其能够基于 进行更新a < min。float max=FLT_MIN如果你想处理负数，你最好设置一下。
See it live: http://ideone.com/XQYkeD.
现场观看：http: //ideone.com/XQYkeD。
回答by Raging Bull
Try this:
尝试这个：
while(1)
{
printf("Enter Number:");
if (scanf("%f", &a)==1)
{
if(a==0) //check if the input value is 0 then break the loop
break;
else
{
if(a>max)
max=a;
if(a<min)
min=a;
}
}
else
break;
}
If entered value is greater than max, then max is replaced by that number. And if a is less than min, then min is replaced by that number.
如果输入的值大于 max，则 max 将替换为该数字。如果 a 小于 min，则 min 替换为该数字。
