View Compilation Error

0_0_2498650_23557.cpp: In function `int main()':
0_0_2498650_23557.cpp:4: error: short, signed or unsigned invalid for `a'
0_0_2498650_23557.cpp:4: error: short, signed or unsigned invalid for `b'
0_0_2498650_23557.cpp:4: error: short, signed or unsigned invalid for `c'
0_0_2498650_23557.cpp:6: error: `num' undeclared (first use this function)
0_0_2498650_23557.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2498650_23557.cpp:11: error: `i' undeclared (first use this function)