二级C语言里面一个题目,有些不明白,初学者求解答。
推荐回答(4个)
1,注意看s的类型,是int。这里每找到一个符合要求的数就将它放入s中,比如,s初始化0,找到第一个,6, 0*10+6=6,找到第二个,3, 6*10+3=63,,,类似的,,每在s后追加一个数就要把s乘以10.
2.注意'0'和0是不一样的,字符'0'的ASCII值是38,C里char类型存储的其实是字符对应的ASCII值,这个你可以查查,这个懂了其他的就好理解了
3.对的,因为*p[2]是一个存储指向char的指针的数组,经过p[i]=c[i]后数组p中存储了两个值,第一个值也就是p[0]存储的是字符串"6934"的首字符'6'的地址,相应的,第二个值也就是p[1]存储的是字符串"8254"的首字符'8'的地址,这时候每个字符串末尾会有一个隐藏字符'\0'来标示字符串的结尾
1、10*s就是进位,比如循环一开始是s=10*0+6,此时6是个位,下一个循环通过10*s就能让6变成十位,直到最后变成千位,你自己可以模拟一下运算过程。
2、似乎是打印错了吧,如果0不加单引号,那就是p[i][j]不为空,按照题意应该是大于0才对,我试了下,在这题中加不加结果都一样
3、*p[2]是指针数组,你去看一下这部分内容,大概意思就是p[0]保存c[0]的地址,p[1]保存c[1]的地址
关于c语言应试,个人觉得要把基础知识点弄懂,多做题
1,s=10*s+p[i][j]-'0' 比如我想拼出1234
我就可以这样,s =0; s = 10 * s + 1;s = 10 * s + 2;s = 10 * s + 3; s = s * 10 + 4;然后s = 1234
另外,p数组是个char型数组,在字符中,0-9是代码连续的,9 的代码- 0 的代码 = 9,这是常见的获取单个数字字符的数字值得方法(单引号代表字符,双引号代表字符窜)
2,带引号代表字符,在char型中,每个字数字代表的符号不同,参考ascii表,并不是编号为0的字符就为0……另外,加上双引号代表这个值是字符,不带双引号代表是数字(char型可以理解为字符的编号)。
3,那是一个for循环啊,循环了两次,就是练个赋值,两个值都付过去了~~~~
1、p[i][j]指针指向当前遍历的c的位置,每个偶数位置取过来,这是取来的值是字符格式的数字,所以和字符0相减,就是数值形式的数字了,加上已经积累的总值S,每次S乘以10,留一个空的个位数,等待下一个数加入
2、0不加引号我也不知道为什么
3、赋的是c[i]的指针,而不是整个字符串,不过实际上是等价于赋了字符串,这么理解也没错
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