View Compilation Error

0_0_34007142_18887.cpp: In function 'int main()':
0_0_34007142_18887.cpp:19:21: error: 'i' was not declared in this scope
     printf("%c",str[i]);
                     ^
0_0_34007142_18887.cpp:24:27: error: 'i' was not declared in this scope
     printf("%d%c",sum,str[i]);
                           ^
0_0_34007142_18887.cpp: At global scope:
0_0_34007142_18887.cpp:35:1: error: expected declaration before '}' token
 }
 ^