View Compilation Error

0_0_23344059_5588.cpp: In function 'int main()':
0_0_23344059_5588.cpp:31:1: error: 'else' without a previous 'if'
 else
 ^
0_0_23344059_5588.cpp:35:17: error: 'mid' was not declared in this scope
 printf("%.4f\n",mid);
                 ^
0_0_23344059_5588.cpp: At global scope:
0_0_23344059_5588.cpp:38:1: error: expected unqualified-id before 'return'
 return 0;
 ^
0_0_23344059_5588.cpp:39:1: error: expected declaration before '}' token
 }
 ^