Compilare: user.c: In function ‘fact’: user.c:8:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&t); ^ user.c:18:29: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<t;i++) {fscanf(f,"%lld",&n);fscanf(f,"%lld",&k); ^ user.c:18:49: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<t;i++) {fscanf(f,"%lld",&n);fscanf(f,"%lld",&k); ^