INT B = 0，A = 1; B = + A + ++中;什么是b的值？什么是它的计算？ [英] int b=0,a=1;b= ++a + ++a; what is the value of b? what is the calculation for it?

问题描述

  INT的main（）
{
    INT B = 0，A = 1; //初始化a和b
    B = + A + + + A; //计算分配b的值
    打印F（％D，B）;
    返回0;
}
 

1. 什么是b的值？


2. 什么是它的计算？

解决方案

这是未定义行为 .Lack 序列点的。

有关更多信息一看<一个href=\"http://stackoverflow.com/questions/859433/which-issues-have-you-encountered-due-to-sequence-points-in-c-and-c\">here和<一个href=\"http://stackoverflow.com/questions/3812850/output-of-multiple-post-and-$p$p-increments-in-one-statement\">output-of-multiple-post-and-$p$p-increments-in-one-statement.

int main()
{
    int b=0,a=1;//initialize a and b
    b=++a + ++a;// calculate assign the value of b
    print f("%d",b);
    return 0;
}

1. what is the value of b?
2. and what is the calculation for it?

解决方案

This is Undefined Behaviour.Lack of sequence point.

For more info have a look here and output-of-multiple-post-and-pre-increments-in-one-statement.

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