左值要求作为分配的C左操作数 [英] lvalue required as left operand of assignment c

问题描述

在这个code

(nr % 10) % 2 == 0 ? a[i] = nr % 10 + 1 : a[i] = nr % 10;

我收到了左值要求作为分配的左操作数。谁能帮我这个？

推荐答案

把括号围绕你的最后分配来解决这个：

Put parentheses around your last assignment to solve this:

(nr % 10) % 2 == 0 ? a[i] = nr % 10 + 1 : (a[i] = nr % 10);

这是因为分配具有较低的precedence比三元运算符等等code像 A = B？ ð：C 被解析为 A =（B C：D），而不是（A = B）？ C：D时。 之间的分配和：并不需要放在括号内，因为没有任何语法歧义。

This is because assignment has a lower precedence than the ternary operator so code like a = b ? d : c is parsed as a = (b ? c : d) and not as (a = b) ? c : d. The assignment between ? and : doesn't need to be placed in parentheses as there isn't any syntactic ambiguity.

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