Compilare: main.cpp: In function 'int main()': main.cpp:18:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&m,&n); ^ main.cpp:22:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ main.cpp:17:17: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,x,a,b; ^ main.cpp:17:15: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,x,a,b; ^