View Compilation Error

0_0_17533102_4695.cpp: In function 'int main()':
0_0_17533102_4695.cpp:8:9: error: expected primary-expression before 'if'
         if(strlen(a)==1&&a[0]=='0')
         ^
0_0_17533102_4695.cpp:8:9: error: expected ')' before 'if'
0_0_17533102_4695.cpp: At global scope:
0_0_17533102_4695.cpp:19:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_17533102_4695.cpp:20:1: error: expected declaration before '}' token
 }
 ^