View Compilation Error

0_0_20982825_12677.cpp:3:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_20982825_12677.cpp:5:1: error: 'inttable' does not name a type
 inttable[]={0,1,2,-1,3,4,5,6,-1,7};//原数字各位上的0-9数字分别对应8进制数的那几位
 ^
0_0_20982825_12677.cpp: In function 'int intmain()':
0_0_20982825_12677.cpp:15:21: error: 'table' was not declared in this scope
             s=s+jie*table[n%10];//原里程的对应每一位转化位8进制数再转化为10进制值
                     ^