View Compilation Error

0_0_37455461_4680.cpp: In function 'int main()':
0_0_37455461_4680.cpp:13:16: error: 's' was not declared in this scope
             if(s[i] >='0' && s[i] <= '9'){
                ^
0_0_37455461_4680.cpp:13:18: error: 'i' was not declared in this scope
             if(s[i] >='0' && s[i] <= '9'){
                  ^