View Compilation Error

149638_0_30119.cpp: In function `int main()':
149638_0_30119.cpp:51: error: no match for 'operator<<' in 'std::cin << t'
149638_0_30119.cpp:54: error: no match for 'operator<<' in 'std::cin << str1'
149638_0_30119.cpp:58: error: `plus' undeclared (first use this function)
149638_0_30119.cpp:58: error: (Each undeclared identifier is reported only once for each function it appears in.)
149638_0_30119.cpp:60: error: expected `;' before string constant
149638_0_30119.cpp:60: error: missing terminating " character