C语言C6387报错应该怎么解决呢

给我报错的内容

#define _CRT_SECURE_NO_WARNINGS
#include"changeword.h"
#include
#include


int ChangeWordType(char* src, char* dest)
{
    //open a file
    FILE* fp1  = fopen(src,"r") == NULL;
    FILE* fp2 = fopen(dest, "wt+") == NULL;
    char buff = fgetc(fp1);
    while (!feof(fp1))
    {
        fputc(toupper(buff), fp2);
        buff = fgetc(fp1);
    }
    fclose(fp1);
    fclose(fp2);

    return 1;
}

把后面的==NULL删掉啊。写这要干啥？

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