sscanf until it reaches a comma

问题:

I'm trying to scanf words and numbers from a string looks like: "hello, world, I, 287876, 6.0" <-- this string is stored in a char array (string) What I need to do is to split things up and assign them to different variables so it would be like

     char a = "hello"
     char b = "world"
     char c = "I"
     unsigned long d = 287876
     float e = 6.0

I know that regular scanf stops reading from stdin when it reaches a white space. So I've been thinking that there might be a way to make sscanf stop reading when it reaches a "," (comma)

I've been exploring the library to find a format for sscanf to read only alphabet and numbers. I couldn't find such a thing, maybe I should look once more.

Any help? Thanks in advance :)

回答1:

If the order of your variables in the string is fixe, I mean It's always:

string, string, string, int, float

the use the following format specifier in sscanf():

int len = strlen(str);
char a[len];
char b[len];
char c[len];
unsigned long d;
float e;

sscanf(" %[^,] , %[^,] , %[^,] , %lu , %lf", a, b, c, &d, &e);

回答2:

This example using strtok should be helpful:

#include <stdio.h>
#include <string.h>

int main ()
{
  char str[] ="hello, world, I, 287876, 6.0" ;
  char * pch;
  printf ("Splitting string \"%s\" into tokens:\n",str);
  pch = strtok (str,",");
  while (pch != NULL)
  {
    printf ("%s\n",pch);
    pch = strtok (NULL, ",");
  }
  return 0;
}

回答3:

See the documentation for strtok and/or strtok_r