求教：初始化问题！
[code=C/C++][/code]
#include "stdafx.h"
#include "stdlib.h"
int main()
{
char a;
int i;
FILE *fpGrade;
if ((fpGrade == fopen("d:\\tx.txt","r"))==NULL) //编译的时候出现：
//Run-Time Check Failure #3 - The variable 'fpGrade' is being used without being initialized.
{
//FILE *fpGrade;
printf("\nConnot open file\n");
exit(0);
}
while ((a=fgetc(fpGrade))!=EOF)
putchar(a);
fclose(fpGrade);
system("PAUSE");
}



[解决办法]
if ((fpGrade == fopen("d:\\tx.txt","r"))==NULL) //编译的时候出现：
这行代码应该这样写
if ((fpGrade = fopen("d:\\tx.txt","r"))==NULL) //编译的时候出现：

对变量fpGrade应该是赋值操作而不是比较操作吧！