Eroare de compilare: user.c: In function ‘main’: user.c:4:33: error: ‘r’ undeclared (first use in this function) FILE *in = fopen("adunare.in", r); ^ user.c:4:33: note: each undeclared identifier is reported only once for each function it appears in user.c:5:35: error: ‘w’ undeclared (first use in this function) FILE *out = fopen("adunare.out", w); ^ user.c:8:15: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘int’ [-Wformat=] fscanf(in, "%d", a); ^ user.c:9:15: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘int’ [-Wformat=] fscanf(in, "%d", b); ^ user.c:8:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", a); ^~~~~~~~~~~~~~~~~~~ user.c:9:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", b); ^~~~~~~~~~~~~~~~~~~