View Compilation Error

D:\HDOJ\temp\2_14855_1026779_11604.c: In function `main':
D:\HDOJ\temp\2_14855_1026779_11604.c:9: error: `i' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1026779_11604.c:9: error: (Each undeclared identifier is reported only once
D:\HDOJ\temp\2_14855_1026779_11604.c:9: error: for each function it appears in.)