View Compilation Error

0_0_32593398_8551.cpp: In function 'void change(char*)':
0_0_32593398_8551.cpp:11:18: error: 's' was not declared in this scope
   for(i = len-1; s[i] == '0'; i--)
                  ^
0_0_32593398_8551.cpp:17:8: error: 's' was not declared in this scope
     if(s[len-1] == '.'){
        ^