C中赋值表达式的结果是什么？

Question

在以下代码中:

int c;
while((c=10)>0)

什么是c = 10评价什么？是1表示值10成功分配给变量c,还是10？为什么？

Answer 1

c = 10是表达式返回10,其也将10分配给c.

Answer 2

据说在C99 6.5.16

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.