foo.cpp:64:5: error: stray '\250' in program
     while(m–)
     ^
foo.cpp: In function 'int main()':
foo.cpp:64:13: error: expected ')' before 'C'
     while(m–)
             ^
foo.cpp:64:13: error: 'C' was not declared in this scope
foo.cpp:60:15: warning: unused variable 'a' [-Wunused-variable]
     int n, m, a, b, c;
               ^
foo.cpp:60:18: warning: unused variable 'b' [-Wunused-variable]
     int n, m, a, b, c;
                  ^
foo.cpp:60:21: warning: unused variable 'c' [-Wunused-variable]
     int n, m, a, b, c;
                     ^