Compilare: user.c: In function ‘main’: user.c:23:3: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(c = strstr(c, a)) { ^ user.c:7:16: warning: unused variable ‘j’ [-Wunused-variable] int n, t, i, j; ^ user.c:7:10: warning: unused variable ‘t’ [-Wunused-variable] int n, t, i, j; ^ user.c:7:7: warning: unused variable ‘n’ [-Wunused-variable] int n, t, i, j; ^ user.c:16:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", a); ^ user.c:17:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", b); ^