switch语句和if语句的一些区别

最新推荐文章于 2024-10-02 09:37:11 发布

iking83

最新推荐文章于 2024-10-02 09:37:11 发布

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分类专栏： c/c++

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/*if (firstkey == 43)
                    {
                        firstnum += secdnum;
                        firstkey = e.KeyChar;
                    }
                    if (firstkey == 45)
                    {
                        firstnum -= secdnum;
                        firstkey = e.KeyChar;
                    }
                    if (firstkey == 42)
                    {
                        firstnum *= secdnum;
                        firstkey = e.KeyChar;
                    }
                    if (firstkey == 47)
                    {
                        firstnum /= secdnum;
                        firstkey = e.KeyChar;

} */

switch (firstkey )
                    {
                        case 43:
                            firstnum += secdnum;
                            firstkey = e.KeyChar;break ;
                        case 45:
                            firstnum -= secdnum;
                            firstkey = e.KeyChar;break ;
                        case 42:
                            firstnum *= secdnum;
                            firstkey = e.KeyChar;break ;
                        case 47:
                            firstnum /= secdnum;
                            firstkey = e.KeyChar;break ;
                    }

switch语句里的case是并行的，，而if语句是顺序执行的，firstkey会互相影响!