Eroare de compilare: user.c:16: warning: built-in function ‘index’ declared as non-function user.c: In function ‘main’: user.c:27: error: ‘i’ undeclared (first use in this function) user.c:27: error: (Each undeclared identifier is reported only once user.c:27: error: for each function it appears in.) user.c:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:24: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:25: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:28: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:29: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result