求助！ ，解决CCS3.3编译出问题

ccs3.3环境下使用了malloc函数，编译出错！

#include "stdlib.h"

int *p;
p=(int *)malloc(100 * sizeof(int));
。。。

"main.c", line 45: error: this declaration has no storage class or type specifier
"main.c", line 45: error: declaration is incompatible with "int *pppp" (declared at line 44)
"main.c", line 45: error: function call is not allowed in a constant expression
"main.c", line 45: error: expression must have arithmetic or pointer type