View Compilation Error

0_0_21361050_29378.cpp: In function 'int main()':
0_0_21361050_29378.cpp:19:14: error: register name not specified for 'i'
 register int i,j,k;
              ^
0_0_21361050_29378.cpp:19:16: error: register name not specified for 'j'
 register int i,j,k;
                ^
0_0_21361050_29378.cpp:19:18: error: register name not specified for 'k'
 register int i,j,k;
                  ^