View Compilation Error

0_0_1384121_24355.cpp: In function `int main()':
0_0_1384121_24355.cpp:4: error: `__int64' undeclared (first use this function)
0_0_1384121_24355.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1384121_24355.cpp:4: error: expected `;' before "num"
0_0_1384121_24355.cpp:6: error: `num' undeclared (first use this function)
0_0_1384121_24355.cpp:7: error: `scanf' undeclared (first use this function)
0_0_1384121_24355.cpp:7: error: `EOF' undeclared (first use this function)
0_0_1384121_24355.cpp:8: error: `printf' undeclared (first use this function)