View Compilation Error

0_0_24680824_17916.cpp: In function 'int main()':
0_0_24680824_17916.cpp:5:12: error: expected initializer before 'sum'
    int a,b sum;
            ^
0_0_24680824_17916.cpp:6:18: error: 'b' was not declared in this scope
    while(cin>>a>>b)
                  ^
0_0_24680824_17916.cpp:8:7: error: 'sum' was not declared in this scope
       sum=a+b;
       ^