代码改变世界

字符串操作

2019-06-28 14:59  hoodguy  阅读(199)  评论(0)    收藏  举报 
 2 char uart_buff[10]={0};
 3 char protocal_buf[10]={0};
 4 char str[5]={0};
 5 
 6 char itoa(unsigned int num,char str[])
 7 {
 8     char  i = 0;
 9     char  j = 0;
10     char  temp[10]= {0};
11 
12     //第一步,1234 to "4321"
13     do
14     {
15         temp[i] = num % 10 + '0';
16         num /= 10;
17         i++;
18     } while(num > 0);
19     temp[i] = '\0';
20     i--;
21     //第三步,"4321-" ====> "-1234"
22     while(i >= 0)
23     {
24         str[j] = temp[i];
25         j++;
26         i--;
27     }
28     str[j] = '\0';
29     return j;
30 }
31 
32 void Int2String(unsigned int int_data,unsigned char data_length_set)
33 {
34     unsigned char  data_length;
35     data_length = itoa(int_data,protocal_buf);
36     if(data_length)
37         strncat(uart_buff,ZERO_TRING,data_length_set-data_length);
38     strcat(uart_buff,protocal_buf);
39 }
40 
41 void main(void)
42 {
43     unsigned char data_length=0;
44     data_length = itoa(1,str);
45     printf("data_length = %d\n",data_length);
46     printf("str = %s\n",str);
47 
48     Int2String(1234,5);
49     printf("uart_buff = %s",uart_buff);
50 }