View Compilation Error

0_0_32575579_16819.cpp: In function 'int main()':
0_0_32575579_16819.cpp:9:31: error: 'ch' was not declared in this scope
                 printf("%c\n",ch[i]);
                               ^
0_0_32575579_16819.cpp:11:30: error: 'ch' was not declared in this scope
                 printf("%c ",ch[i]);
                              ^