View Compilation Error

0_0_8270596_30199.cpp: In function `int main()':
0_0_8270596_30199.cpp:27: error: expected `;' before "cin"
0_0_8270596_30199.cpp:37: error: `plus' undeclared (first use this function)
0_0_8270596_30199.cpp:37: error: (Each undeclared identifier is reported only once for each function it appears in.)