View Compilation Error

0_0_8302234_6924.cpp: In function `int main()':
0_0_8302234_6924.cpp:4: error: `a' undeclared (first use this function)
0_0_8302234_6924.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8302234_6924.cpp:4: error: `b' undeclared (first use this function)
0_0_8302234_6924.cpp:4: error: `sum' undeclared (first use this function)
0_0_8302234_6924.cpp:5: error: `sun' undeclared (first use this function)