Question:
If three records have been written to a text file(each record having 3 int fields) and each integer field is seperated by a comma, how do you retrieve only the int values from each record (i.e no character retrieval)and print to screen using fscanf and printf?
For example, the file contains:
1,2,3,
4,5,6,
7,8,9,
The screen output should be:
1 2 3
4 5 6
7 8 9
Answer:
Although it isn’t used much by C++ developers these days, scanf and fscanf provide a lot of functionality.
My preference would be to read each line into a buffer and then call sscanf. This gives you a little more control. But, given the file format you specified, you could easily read in the contents with the following code:
#include main(){ FILE* f; int a, b, c; f = fopen("c:\test.dat", "r"); if (f != NULL) { while(!feof(f)) { if (fscanf(f, "%d,%d,%d,
", &a, &b, &c) != 3) { printf("Syntax error found in file.
"); break; } printf("%d %d %d
", a, b, c); } fclose(f); } return 0;} 
