我想逐行传递C文件并使用scanf进行读取，但跳过第一行

Question

#include <stdio.h>
#include <stdlib.h>

int 
main(void){

 //Declare variables
  //Want to read the first line and then ignore it.  From the second line
  //I scan in the input values and then store them in their individual arrays.

     int yy, mm, dd, loc;
     double mx, mm;
         /*Read and discard the first line of the file*/
          scanf("%*[^\n]");

         /*Read from the second line*/
         while(scanf("%d,%d,%d,%d,%lf,%lf\n",
                    &loc, &yy, &mm, &dd, &mx, &mn) == 6){

            //Storing each input in its own array.
  }

}

Answer 1

scanf("%*[^\\n]"); will indeed read and discard up to the first newline, but won't discard the newline itself. I suggest pairing that with getchar(); .

\\n within a format string doesn't do what you think it does; as scanf isn't line-oriented (but instead field-oriented), you may find it'll discard all whitespace characters , not just newlines . I wouldn't see that as a problem. If you want to literally discard the remainder of the line, you could do so using the same code suggested to discard the first line:

scanf("%*[^\n]");
getchar();

---

There are two declarations of mm in your code, though you've not mentioned an error message so I guess your testcase isn't accurate and you intended one of them (the double ) to be mn instead.

With those issues covered, as my testcase (included below) demonstrates I'd expect that your program is capable of reading and discarding the first line, and then reading four fields of int s as decimal digits followed by two fields of double s as decimal digits, separated by commas.

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int yy, mm, dd, loc;
    double mx, mn;

    scanf("%*[^\n]");
    getchar();

    while (scanf("%d,%d,%d,%d,%lf,%lf\n", &loc, &yy, &mm, &dd, &mx, &mn) == 6){
        printf("<%d> <%d> <%d> <%d> <%f> <%f>\n", loc, yy, mm, dd, mx, mn);
    }
}

---

UPDATE : By the looks of one of your comments, this doesn't actually meet your assignment requirements. "You should use a seperate while(getchar()) loop to consume the first line" , and so scanf("%*[^\\n]"); getchar(); scanf("%*[^\\n]"); getchar(); should be replaced with your loop.

If you end up adding an attempt at that loop to your question, feel free to ping me so I can provide feedback.