View Compilation Error

0_0_5377804_22090.c: In function `main':
0_0_5377804_22090.c:9: error: syntax error before '/' token
0_0_5377804_22090.c:19: error: `ch' undeclared (first use in this function)
0_0_5377804_22090.c:19: error: (Each undeclared identifier is reported only once
0_0_5377804_22090.c:19: error: for each function it appears in.)