View Compilation Error

86452_0_27621.c: In function `main':
86452_0_27621.c:12: error: `s' undeclared (first use in this function)
86452_0_27621.c:12: error: (Each undeclared identifier is reported only once
86452_0_27621.c:12: error: for each function it appears in.)
86452_0_27621.c:29: error: syntax error at end of input