网站ping怎么做,手机免制作app软件下载,有品质的网站推广公司,广东城乡建设厅网站首页目录效果普通数字小数科学记数法源码平台#xff1a; STC89C52 Keil uVision V5.29.0.0 PK51 Prof.Developers Kit Version:9.60.0.0 效果
这里以51单片机为例#xff0c;对串口接收的字符串中的第三个数进行解码#xff1a; 普通数字 小数 科学记数法 源码
/*
* Str2N…
目录效果普通数字小数科学记数法源码平台 STC89C52 Keil uVision V5.29.0.0 PK51 Prof.Developers Kit Version:9.60.0.0 效果
这里以51单片机为例对串口接收的字符串中的第三个数进行解码 普通数字 小数 科学记数法 源码
/*
* Str2Num.h
*
* Created on: 2021/11/6
* Author: 乙酸氧铍
*/#ifndef STR2NUM_H_
#define STR2NUM_H_#include stdint.h/*
str:数字字符串首地址
flag:分隔符
no:第no个数字 从1开始计
Output: 输出结果
*/extern void str2int(char * str, char flag, int32_t no, int32_t *Output);
extern void str2double(char * str, char flag, int32_t no, double *Output);#endif /* STR2NUM_H_ */
/*
* Str2Num.c
*
* Created on: 2021/11/6
* Author: 乙酸氧铍
*/
#include Str2Num.hvoid str2int(char * str, char flag, int32_t no, int32_t *Output)
{int32_t id_end, count, output;for (id_end 0, count 0; count ! no; id_end){if (str[id_end] flag || str[id_end] \r || str[id_end] \n || str[id_end] \0)count;}id_end - 2;for (output 0, count 1; str[id_end] ! flag id_end 0; --id_end){ if (str[id_end] -)output * -1;else if (str[id_end] );else {output (str[id_end] - 0) * count;count * 10;}}*Output output;
}void str2double(char * str, char flag, int32_t no, double *Output)
{int32_t id_end, id_dot, id_e, count, id, pow;double output;for (id_end 0, count 0; count ! no; id_end){if (str[id_end] flag || str[id_end] \r || str[id_end] \n || str[id_end] \0)count;}id_end - 2; //寻找最后一个数字的下标for (id_dot id_end, id_e -1; str[id_dot] ! .; --id_dot){if (str[id_dot] e || str[id_dot] E)id_e id_dot; //标记e的下标if (str[id_dot] flag || str[id_dot] \r || str[id_dot] \n || str[id_dot] \0){if(id_e 0)id_dot id_e;elseid_dot id_end 1; break;}}output 0;if (str[id_dot] .){for (count 10, id id_dot 1; str[id] ! flag str[id] ! \r str[id] ! \n str[id] ! \0 str[id] ! e str[id] ! E; id){output (str[id] - 0) / (double)count; //加入小数部分count * 10;}}for (count 1, id id_dot - 1; str[id] ! flag id 0; --id){if (str[id] -)output * -1;else if (str[id] );else{output (str[id] - 0) * count;count * 10; //加入整数部分}}if(id_e 0) //指数计算{ for (pow 0, count 1; id_end ! id_e; --id_end){if (str[id_end] );else if (str[id_end] -)pow * -1;else { pow (str[id_end] - 0) * count;count * 10;}}if (pow 0)while (pow--)output * 10;else if(pow 0)while (pow)output / 10;}*Output output;
}
