Compilare: user.c: In function ‘bubbsort’: user.c:17:13: warning: ‘return’ with a value, in function returning void [enabled by default] return a; ^ user.c: In function ‘main’: user.c:109:24: warning: unused variable ‘k’ [-Wunused-variable] unsigned int n,s,i,k=0,r[6]={0,0,0,0,0,0}; ^ user.c:112:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%u %u",&n,&s); ^ user.c:115:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%u",&val[i]); ^