a.c: In function ‘ComputePolylist’: a.c:123:1: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%f", &x); ^~~~~~~~~~~~~~~
时间: 2023-07-08 22:49:36 浏览: 221
这个警告是由于你在代码中使用了scanf函数但没有检查其返回值,也就是说程序无法判断是否成功读取了输入。在某些情况下,这可能会导致程序出现未定义的行为。为了解决这个问题,你可以在scanf函数调用之后立即检查其返回值,确保它成功读取了输入。例如,你可以使用以下代码:
```
if (scanf("%f", &x) != 1) {
// 处理读取失败的情况
}
```
相关问题
a.c:+In+function+‘main’:+a.c:5:5:+warning:+ignoring+return+value+of+‘scanf’,+declared+with+attribute
这个警告是由于在main函数中使用了scanf函数,但是没有检查scanf函数的返回值。scanf函数的返回值表示成功读取的参数个数,如果返回值不等于期望读取的参数个数,说明读取失败。为了避免这种情况,应该检查scanf函数的返回值。
另外,警告中还提到了一个“attribute”,这是指scanf函数在声明时使用了某种特殊的属性。这个属性可能是用来告诉编译器对scanf函数进行特殊处理,比如检查其返回值。具体的属性需要查看代码中的声明部分才能确定。
warning:ignoring return value of "scanf",declared with attribute
"warn_unused_result"
This warning is issued by the compiler when the return value of the "scanf" function is ignored in your code. The "scanf" function is used to read input from the console or a file and store it in variables. It returns the number of input items successfully matched and assigned. Ignoring the return value can lead to unexpected behavior or errors in your program.
To fix this warning, you should always check the return value of "scanf" and handle any errors or unexpected input appropriately. You can also disable this warning by adding the following compiler flag to your code:
-Wno-unused-result
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