两个十进制字符相加得到十进制字符的结果和进位

wangarc 发表于 2024-9-12 21:05

本帖最后由 wangarc 于 2024-9-14 16:42 编辑

两个十进制字符，相加得到十进制字符的结果和进位。好久没写C了，都快忘了，欢迎大家来批评。
比如：字符 '6' + 字符 '8' + 进位 '1' = 进位 '1' 和结果 '5'。

int dec_char_add(char in_carry, char c1, char c2, char * out_carry, char * result);
/* dec_char_add() return 1 if no error, otherwise 0
*
* c1 ['0'-'9'] '6'
* + c2 ['0'-'9'] + '8'
* + in_carry ['0'-'1'] + '1'
* _________________________________________ ________________
* = out_carry result = '1' '5'
* ['0'-'1'] ['0'-'9']
*/

int dec_char_add(char in_carry, char c1, char c2, char * out_carry, char * result)
{
int ret_val = 1; //return value, 1 = no error, otherwise 0
switch (c1) //go through "switch case" to get answer without calculate.
{
case '0': switch (c2)
{
case '0': *out_carry = '0'; *result = '0'; break;
case '1': *out_carry = '0'; *result = '1'; break;
case '2': *out_carry = '0'; *result = '2'; break;
case '3': *out_carry = '0'; *result = '3'; break;
case '4': *out_carry = '0'; *result = '4'; break;
case '5': *out_carry = '0'; *result = '5'; break;
case '6': *out_carry = '0'; *result = '6'; break;
case '7': *out_carry = '0'; *result = '7'; break;
case '8': *out_carry = '0'; *result = '8'; break;
case '9': *out_carry = '0'; *result = '9'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '1': switch (c2)
{
case '0': *out_carry = '0'; *result = '1'; break;
case '1': *out_carry = '0'; *result = '2'; break;
case '2': *out_carry = '0'; *result = '3'; break;
case '3': *out_carry = '0'; *result = '4'; break;
case '4': *out_carry = '0'; *result = '5'; break;
case '5': *out_carry = '0'; *result = '6'; break;
case '6': *out_carry = '0'; *result = '7'; break;
case '7': *out_carry = '0'; *result = '8'; break;
case '8': *out_carry = '0'; *result = '9'; break;
case '9': *out_carry = '1'; *result = '0'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '2': switch (c2)
{
case '0': *out_carry = '0'; *result = '2'; break;
case '1': *out_carry = '0'; *result = '3'; break;
case '2': *out_carry = '0'; *result = '4'; break;
case '3': *out_carry = '0'; *result = '5'; break;
case '4': *out_carry = '0'; *result = '6'; break;
case '5': *out_carry = '0'; *result = '7'; break;
case '6': *out_carry = '0'; *result = '8'; break;
case '7': *out_carry = '0'; *result = '9'; break;
case '8': *out_carry = '1'; *result = '0'; break;
case '9': *out_carry = '1'; *result = '1'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '3': switch (c2)
{
case '0': *out_carry = '0'; *result = '3'; break;
case '1': *out_carry = '0'; *result = '4'; break;
case '2': *out_carry = '0'; *result = '5'; break;
case '3': *out_carry = '0'; *result = '6'; break;
case '4': *out_carry = '0'; *result = '7'; break;
case '5': *out_carry = '0'; *result = '8'; break;
case '6': *out_carry = '0'; *result = '9'; break;
case '7': *out_carry = '1'; *result = '0'; break;
case '8': *out_carry = '1'; *result = '1'; break;
case '9': *out_carry = '1'; *result = '2'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '4': switch (c2)
{
case '0': *out_carry = '0'; *result = '4'; break;
case '1': *out_carry = '0'; *result = '5'; break;
case '2': *out_carry = '0'; *result = '6'; break;
case '3': *out_carry = '0'; *result = '7'; break;
case '4': *out_carry = '0'; *result = '8'; break;
case '5': *out_carry = '0'; *result = '9'; break;
case '6': *out_carry = '1'; *result = '0'; break;
case '7': *out_carry = '1'; *result = '1'; break;
case '8': *out_carry = '1'; *result = '2'; break;
case '9': *out_carry = '1'; *result = '3'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '5': switch (c2)
{
case '0': *out_carry = '0'; *result = '5'; break;
case '1': *out_carry = '0'; *result = '6'; break;
case '2': *out_carry = '0'; *result = '7'; break;
case '3': *out_carry = '0'; *result = '8'; break;
case '4': *out_carry = '0'; *result = '9'; break;
case '5': *out_carry = '1'; *result = '0'; break;
case '6': *out_carry = '1'; *result = '1'; break;
case '7': *out_carry = '1'; *result = '2'; break;
case '8': *out_carry = '1'; *result = '3'; break;
case '9': *out_carry = '1'; *result = '4'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '6': switch (c2)
{
case '0': *out_carry = '0'; *result = '6'; break;
case '1': *out_carry = '0'; *result = '7'; break;
case '2': *out_carry = '0'; *result = '8'; break;
case '3': *out_carry = '0'; *result = '9'; break;
case '4': *out_carry = '1'; *result = '0'; break;
case '5': *out_carry = '1'; *result = '1'; break;
case '6': *out_carry = '1'; *result = '2'; break;
case '7': *out_carry = '1'; *result = '3'; break;
case '8': *out_carry = '1'; *result = '4'; break;
case '9': *out_carry = '1'; *result = '5'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '7': switch (c2)
{
case '0': *out_carry = '0'; *result = '7'; break;
case '1': *out_carry = '0'; *result = '8'; break;
case '2': *out_carry = '0'; *result = '9'; break;
case '3': *out_carry = '1'; *result = '0'; break;
case '4': *out_carry = '1'; *result = '1'; break;
case '5': *out_carry = '1'; *result = '2'; break;
case '6': *out_carry = '1'; *result = '3'; break;
case '7': *out_carry = '1'; *result = '4'; break;
case '8': *out_carry = '1'; *result = '5'; break;
case '9': *out_carry = '1'; *result = '6'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '8': switch (c2)
{
case '0': *out_carry = '0'; *result = '8'; break;
case '1': *out_carry = '0'; *result = '9'; break;
case '2': *out_carry = '1'; *result = '0'; break;
case '3': *out_carry = '1'; *result = '1'; break;
case '4': *out_carry = '1'; *result = '2'; break;
case '5': *out_carry = '1'; *result = '3'; break;
case '6': *out_carry = '1'; *result = '4'; break;
case '7': *out_carry = '1'; *result = '5'; break;
case '8': *out_carry = '1'; *result = '6'; break;
case '9': *out_carry = '1'; *result = '7'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
case '9': switch (c2)
{
case '0': *out_carry = '0'; *result = '9'; break;
case '1': *out_carry = '1'; *result = '0'; break;
case '2': *out_carry = '1'; *result = '1'; break;
case '3': *out_carry = '1'; *result = '2'; break;
case '4': *out_carry = '1'; *result = '3'; break;
case '5': *out_carry = '1'; *result = '4'; break;
case '6': *out_carry = '1'; *result = '5'; break;
case '7': *out_carry = '1'; *result = '6'; break;
case '8': *out_carry = '1'; *result = '7'; break;
case '9': *out_carry = '1'; *result = '8'; break;
default: ret_val = 0; //Error: c2 out of range
}
break;
default: ret_val = 0; //Error: c1 out of range
}
switch (in_carry) //go through "switch case" to get answer without calculate.
{
case '0': break;
case '1': switch (*result)
{
case '0': *result = '1'; break;
case '1': *result = '2'; break;
case '2': *result = '3'; break;
case '3': *result = '4'; break;
case '4': *result = '5'; break;
case '5': *result = '6'; break;
case '6': *result = '7'; break;
case '7': *result = '8'; break;
case '8': *result = '9'; break;
case '9': *out_carry = '1'; *result = '0'; break;
}
break;
default: ret_val = 0; //Error: in_carry out of range
}
if (ret_val != 1)
{
*out_carry = '0';
*result = '0';
}
return ret_val;
}

JARK006 发表于 2024-9-12 21:38

```c
int dec_char_add(char in_carry, char c1, char c2, char* out_carry, char* result) {
if (c1 < '0' || '9' < c1) {
   *out_carry = '0';
   *result = '0';
   return 1;
}

if (c2 < '0' || '9' < c2) {
   *out_carry = '0';
   *result = '0';
   return 2;
}

if (in_carry < '0' || '9' < in_carry) {
   *out_carry = '0';
   *result = '0';
   return 3;
}

int sum = (in_carry - '0') + (c1 - '0') + (c2 - '0');
*out_carry = (sum / 10) + '0';
*result = (sum % 10) + '0';

return 0;
}
```

DEATHTOUCH 发表于 2024-9-12 22:11

看看leetcode第2题，两数相加。和你这个还挺有关系的呢。

wangarc 发表于 2024-9-12 22:33

JARK006 发表于 2024-9-12 21:38
```c
int dec_char_add(char in_carry, char c1, char c2, char* out_carry, char* result) {
if ...

{:1_921:}这样有个前提啊，需要0-9的编码是连续的。不过，还没见过不连续的。:lol

wangarc 发表于 2024-9-12 22:34

DEATHTOUCH 发表于 2024-9-12 22:11
看看leetcode第2题，两数相加。和你这个还挺有关系的呢。

俺没刷过leetcode，太高级了。

JARK006 发表于 2024-9-13 01:03

wangarc 发表于 2024-9-12 22:33
这样有个前提啊，需要0-9的编码是连续的。不过，还没见过不连续的。

你去查一下ASCII码表就明白了

wangarc 发表于 2024-9-13 07:09

JARK006 发表于 2024-9-13 01:03
你去查一下ASCII码表就明白了

嗯嗯，明白，ASCII是连续的。

ice2flash 发表于 2024-9-13 10:32

现在看代码，如同看天书{:1_925:}

侃遍天下无二人 发表于 2024-9-13 11:03

你写的怎么这么复杂

wangarc 发表于 2024-9-13 12:31

侃遍天下无二人发表于 2024-9-13 11:03
你写的怎么这么复杂

突发奇想，字符拼凑。

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两个十进制字符相加得到十进制字符的结果和进位