【原创】如何使用逗号 (,) 作为分隔符 sscanf示例和fscanf示例

一、sscanf示例

/* The following sample illustrates the use of brackets and the
   caret (^) with sscanf().
   Compile options needed: none
*/ 

#include 
#include 
#include 

char *tokenstring = "first,25.5,second,15";
int result, i, rv;
double fp;
char o[10], f[10], s[10], t[10];

void main()
{
   result = sscanf(tokenstring, "%[^','],%[^','],%[^','],%s", o, s, t, f);
   fp = atof(s);
   i  = atoi(f);
   printf("%s\n %lf\n %s\n %d\n", o, fp, t, i);
}

二、fscanf示例

/* The following sample illustrates the use of brackets and the
   caret (^) with sscanf().
   Compile options needed: none
*/ 

#include 
#include 
#include 

char *tokenstring = "first,25.5,second,15";
int result, i;
double fp;
char o[10], f[10], s[10], t[10];

FILE *filep; //文件的打开、关闭操作在此省略

void main()
{
   rv = fscanf(filep, "%s", tokenstring);

   result = sscanf(tokenstring, "%[^','],%[^','],%[^','],%s", o, s, t, f);

   fp = atof(s);
   i  = atoi(f);
   printf("%s\n %lf\n %s\n %d\n", o, fp, t, i);

}
如果你直接使用fscanf读取文件中存放的字符串"first,25.5,second,15"，
即fscanf(fp, "%[^','],%[^','],%[^','],%s", o, s, t, f);
结果会失败，原因我还没有调查出来。

你必须先把文件中存放的字符串读入tokenstring中，将文件操作转化为内存操作，才能解析成功。