View Compilation Error

0_0_37455948_3989.cpp: In function 'int main()':
0_0_37455948_3989.cpp:3:129: error: expected ';' before string constant
 int main(){int t; cin >> t; for(int i = 1; i <= t; i++){long long a, b; cin >> a >> b; cout << "Case " << i << ":\n"; cout << a " + " << b << " = " << a+b << '\n'; cout << '\n';} return 0;}
                                                                                                                                 ^