View Compilation Error

0_0_26407043_8526.cpp: In function 'int main()':
0_0_26407043_8526.cpp:8:1: error: expected ';' before 'scanf'
 scanf("%d",&a,&b);
 ^
0_0_26407043_8526.cpp:11:8: error: 'o' was not declared in this scope
 return o
        ^
0_0_26407043_8526.cpp:12:1: error: expected ';' before '}' token
 }
 ^