View Compilation Error

0_0_14011228_10184.cpp:8:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_14011228_10184.cpp: In function 'int main()':
0_0_14011228_10184.cpp:15:7: error: expected primary-expression before '%' token
 scanf(%lf),&a);
       ^
0_0_14011228_10184.cpp:15:8: error: 'lf' was not declared in this scope
 scanf(%lf),&a);
        ^
0_0_14011228_10184.cpp: At global scope:
0_0_14011228_10184.cpp:30:1: error: expected declaration before '}' token
 }
 ^