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

// Primitive File Parsing.
//
// This code demonstrates some of the less familiar features of sscanf that are 
// useful for file parsing. The program reads and prints how many ints are 
// there per line in a given text file.

int main()
{
	FILE *fp;
	int a, num, count;
	char BUFFER[1024];
	
	if( (fp = fopen("numbers.txt", "r")) == NULL)
	{		
		printf("File not found!\n");
		return -1; // exit the program here
	} 


	while (fgets(BUFFER, 1024, fp) != NULL ) // read one line into BUFFER (up to 1024 character max)
	{
		int idx=0;
		int k=0;
		
		do
		{
			num = sscanf( &(BUFFER[idx]), "%d%n", &a, &count);  // num should be 1 if everythign was read OK
		     	                                                // %n does not read anyting from the string but
		        	                                            //   it stores the number of characters read in count.
			if(num == 1)
			{
				printf("%d, ", a);
				idx+=count; // advance the index into BUFFER for the next call to sscanf
				k++;
			}

		} while(num != EOF);
		
		printf("[%d ints on this line]\n", k);
	}
	
	fclose(fp);
	
	system("pause");
}