读取文件中的数据作出判断

#include

int main(void)
{
        FILE *fp;
        char ch;
        int i = 0;
        char a[1024];

        fp = fopen("./test.txt", "rw");
        if(fp == NULL)
        {
                printf("cannot open file!\n");
                exit(1);
        }

        ch = fgetc(fp);
        while(ch != EOF)
        {
                a[i++] = ch;
                ch = fgetc(fp);
        }
        a[i] = '\0';
        printf("a = %s\n", a);

        int val = atoi(a);
        printf(" a = %d\n", val);

        int ret;
        if((val >= 3300)||(val < 3525))
        {
                ret = 1;
        }
        else if((val >= 3525 )||(val < 3750))
        {
                ret = 2;
        }
        else if((val >= 3750)||(val < 3975))
        {
                ret = 3;
        }
        else if((val >= 3975)||(val <= 4200))
        {
                ret = 4;
        }
        switch(ret)
        {
                case 1:
                        printf("1\n");
                break;
                case 2:
                        printf("2\n");
                break;
                case 3:
                        printf("3\n");
                break;
                fault:
                break;
        }

        return 0;
}
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