View Compilation Error

0_0_18140945_5230.cpp: In function 'int main()':
0_0_18140945_5230.cpp:56:27: error: 'half' was not declared in this scope
                     if(l1+half-1<l2)
                           ^
0_0_18140945_5230.cpp:64:21: error: expected '}' before 'else'
                     else
                     ^
0_0_18140945_5230.cpp:66:25: error: 'k' was not declared in this scope
                         k=k-(l2-l1);
                         ^
0_0_18140945_5230.cpp:70:17: error: 'else' without a previous 'if'
                 else
                 ^
0_0_18140945_5230.cpp:89:25: error: 'ans' was not declared in this scope
         printf("%.1f\n",ans);
                         ^
0_0_18140945_5230.cpp: At global scope:
0_0_18140945_5230.cpp:91:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_18140945_5230.cpp:92:1: error: expected declaration before '}' token
 }
 ^