View Compilation Error

0_0_5434767_29906.cpp:2: error: `LL' does not name a type
0_0_5434767_29906.cpp:8: error: `LL' does not name a type
0_0_5434767_29906.cpp: In function `int main()':
0_0_5434767_29906.cpp:14: error: `LL' undeclared (first use this function)
0_0_5434767_29906.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5434767_29906.cpp:14: error: expected `;' before "a"
0_0_5434767_29906.cpp:15: error: `a' undeclared (first use this function)
0_0_5434767_29906.cpp:15: error: `b' undeclared (first use this function)
0_0_5434767_29906.cpp:15: error: `scanf' undeclared (first use this function)
0_0_5434767_29906.cpp:15: error: `EOF' undeclared (first use this function)
0_0_5434767_29906.cpp:22: error: `calc' undeclared (first use this function)
0_0_5434767_29906.cpp:25: error: `printf' undeclared (first use this function)