mdk5明明只定义了一遍int deng，为什么编译后会提示错误重复定义？

main.c 赋值0 G" [/ x+ N. K6 v
deng=1;

inf.h定义
+ z5 t0 ~/ J0 a5 a! \int deng;

inf.c判断# n( b4 [3 {& q( B  }: k, }
void iff(void){
, h& I; V- x  o  A4 [if(deng==1){}# I$ c3 q$ Y1 s1 _* t5 R
}

test.c调用iff

为什么只定义了一遍的deng，会出错误提示重复定义。

Error: L6200E: Symbol deng multiply defined (by inf.o and main.o).
0 d; \! d( ]  M4 ~  f% xError: L6200E: Symbol deng multiply defined (by test.o and main.o).

Not enough information to list image symbols.
7 ?6 |  ^& M7 @$ ]+ D! TNot enough information to list the image map.! f  E) s$ D+ \% R& M8 H
求解