/in/foo.cc: In function 'void power()':
/in/foo.cc:17:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k=1;
        ^
/in/foo.cc: In function 'void jian()':
/in/foo.cc:40:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,len3;
        ^
/in/foo.cc:40:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,len3;
          ^
/in/foo.cc: In function 'int pd()':
/in/foo.cc:57:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k;
        ^
/in/foo.cc:57:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k;
          ^
/in/foo.cc: In function 'void jian1()':
/in/foo.cc:70:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,len3;
        ^
/in/foo.cc:70:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,len3;
          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:88:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k;
          ^