View Compilation Error

0_0_27274966_25123.cpp: In function 'int mian()':
0_0_27274966_25123.cpp:6:16: error: lvalue required as left operand of assignment
       if(a=0&&b=0){
                ^
0_0_27274966_25123.cpp: At global scope:
0_0_27274966_25123.cpp:16:1: error: expected unqualified-id before 'return'
 return 0;
 ^
0_0_27274966_25123.cpp:17:1: error: expected declaration before '}' token
 }
 ^