View Compilation Error

0_0_1534549_18561.cpp: In function `int main()':
0_0_1534549_18561.cpp:9: error: `c' undeclared (first use this function)
0_0_1534549_18561.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1534549_18561.cpp:9: error: expected primary-expression before ')' token