C中赋值表达式的结果是什么？-WhatistheresultofanassignmentexpressioninC?

9  

c = 10 is an expression returning 10 which also assigns 10 to c.

c = 10是表达式返回10,其也将10分配给c。

1  

while((c=10)>0)

c = 10 should return 10.

c = 10应该返回10。

Now, for while(10>0) 10>0, the > operator returns 1 (non-zero value).

现在,对于while(10> 0)10> 0,>运算符返回1(非零值)。

1  

Assignment returns with the assigned value. In case c=10 is 10. Since 10!=0, in c it means also true so this is an infinite loop.

赋值返回指定的值。在c = 10的情况下是10.由于10!= 0,在c中它也意味着是,因此这是无限循环。

It is like you would write

就像你会写的那样

while(10)

Plus You've made the assignment.

加上你完成了作业。

If You follow this logic, You can see, that

如果你遵循这个逻辑,你可以看到,那

while(c=0)

would be a loop that never executes its statement or block.

将是一个永远不会执行其语句或块的循环。

1  

This is an infinite loop. It first assign 10 to c, then compare it with c > 0, then again loop starts, assign 10 to c, compare it with c>0 and so on. Loop never ends. This is equivalent to the following:

这是一个无限循环。首先将10分配给c,然后将其与c> 0进行比较,然后再次循环开始,将10分配给c,将其与c> 0进行比较,依此类推。循环永不结束。这相当于以下内容:

while(c=10);

/* Because c assign a garbage value, but not true for all cases maybe it assign 0 */
while(c); 

Edit: It will not return 10 because compiler return only true or false value, so it return true or 1 instead of 10.

编辑:它不会返回10因为编译器只返回true或false值,所以它返回true或1而不是10。

0  

It is said in C99 6.5.16

在C99 6.5.16中说

An assignment operator stores a value in the object designated by the left operand. An        
assignment expression has the value of the left operand after the assignment, but is not an 
lvalue.