View Compilation Error

117208_0_30106.c: In function `main':
117208_0_30106.c:10: error: `true' undeclared (first use in this function)
117208_0_30106.c:10: error: (Each undeclared identifier is reported only once
117208_0_30106.c:10: error: for each function it appears in.)
117208_0_30106.c:20: error: syntax error before "cipher"