使用“ If语句”；在基本的C编程中。如何正确格式化它们？ [英] Using "If Statements" in basic C programming. How can I properly format them?

问题描述

首先，下面是我到目前为止所掌握的代码。

To begin, the code that I have got up to this point is below.

计算器可以完成我想要做的所有事情，但实际上它仍然包含计算中为负数。如果半径表示的数字小于零，我不希望它做任何事情，但是如果数字为非负数，我仍然希望计算。但是，我在使用if语句时遇到问题。我以前从未使用过这些，因为我真的只是一个初学者。我只需要向正确的方向推进即可。我是否需要其他？

The calculator does everything I want it to, minus the fact that it still includes negative numbers in its calculations. I would like for it to do nothing if the number presented as the radius is less than zero, yet still calculate if the number is non-negative. However, I am having issues with using an if statement. I have not used these before, as I am really just a beginner. I just need a push in the right direction. Do I need to have an "else"? Any help is greatly appreciated!

#include <stdio.h>

int radius, area;

main()
{
    printf("Enter radius: ");
    scanf("%d", &radius);
    {
    if (&radius > -1);  {
         area = (int)(3.14159 * radius * radius);
         printf("Area = %d\n", area);}
    else {
       return(0); }
    }
   return(0);
}

推荐答案

删除半冒号

删除此行的分号

if (&radius > -1);  {  

应该是

if (radius > -1)  {

应该这样做以便更轻松地跟踪if-else语句

更改这些行

printf("Area = %d\n", area);}

return(0); }

至

printf("Area = %d\n", area);
}

return(0); 
}

这里是if-else语句的样式，我认为这更容易

if (condition) {
    statements;
} 
else if (condition) { 
    statements;
}
else {
    statements;
}

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