/in/foo.cc: In function 'int main()':
/in/foo.cc:7:10: warning: unused variable 'c' [-Wunused-variable]
 {int a,b,c,d,i,j,n,m; 
          ^
/in/foo.cc:7:12: warning: unused variable 'd' [-Wunused-variable]
 {int a,b,c,d,i,j,n,m; 
            ^
/in/foo.cc:7:16: warning: unused variable 'j' [-Wunused-variable]
 {int a,b,c,d,i,j,n,m; 
                ^
/in/foo.cc:7:18: warning: unused variable 'n' [-Wunused-variable]
 {int a,b,c,d,i,j,n,m; 
                  ^
/in/foo.cc:7:20: warning: unused variable 'm' [-Wunused-variable]
 {int a,b,c,d,i,j,n,m; 
                    ^