Compilare: user.cpp: In function ‘int main()’: user.cpp:46:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,x,y,cos,sum=0,al,be; ^ user.cpp:46:31: warning: unused variable ‘al’ [-Wunused-variable] int n,m,i,j,x,y,cos,sum=0,al,be; ^~ user.cpp:46:34: warning: unused variable ‘be’ [-Wunused-variable] int n,m,i,j,x,y,cos,sum=0,al,be; ^~ user.cpp:47:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:50:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&x,&y,&cos); ^