View Compilation Error

0_0_15063179_28259.cpp: In function 'int main()':
0_0_15063179_28259.cpp:37:17: error: 'a' was not declared in this scope
                 a[i]/=2;
                 ^
0_0_15063179_28259.cpp:46:19: error: 'a' was not declared in this scope
                if(a[4])
                   ^
0_0_15063179_28259.cpp:55:20: error: 'a' was not declared in this scope
                 if(a[3])
                    ^
0_0_15063179_28259.cpp:64:20: error: 'a' was not declared in this scope
                 if(a[2])
                    ^
0_0_15063179_28259.cpp:73:20: error: 'a' was not declared in this scope
                 if(a[1])
                    ^