Question

I am trying to input txt files into my C program that look something like this

123 x 182   //this is a comment in the file
1234 c 1923  //this is another comment in the file
12 p 3      //this is another comment in the file

I need to store the int, the single character and the other int on each line and then I want to ignore everything else on the line. Here is what I tried….

while (fscanf(file, "%d %c %d", &one,&two,&three) !=EOF)
                {
                        printf("%d %c %d\n", one,two,three);
                }

Right now I’m just printing out the values to test the process. So, if I test this with a file that does not have any comments or extra stuff after the first 3 things I need, it works perfectly. But if there is extra stuff, I get stuck in an infinite loop where the first line is repeatedly printed.

Answer 1

There may be a better way in C, but you could add a loop inside of your current loop to read in the remaining characters until you hit a newline.

while (fscanf(file, "%d %c %d", &one,&two,&three) !=EOF)
{
     printf("%d %c %d\n", one,two,three);
     while(fgetc(file) != '\n'){};
}

This should break out of the nested while loop as soon as the character it gets is a newline, and the next fscanf will begin on the next line.