无法从C中的文件中读取字符串并将其作为lc3解析器进行操作

我想创建一个程序，扫描文件的内容：

1283

5105

lc3中两条指令的hex代码：

添加r1，r2，r3

和r0，r4，r5

我希望我的程序读取此文件并在屏幕上打印两个相应的说明，有人可以告诉我它有什么问题

#include  #include  #include  int main(int argc, char *argv[]) { FILE *file; char hexString[5]; int dr, sr1, sr2, instruction; file = fopen(argv[1], "r"); while (fscanf(file, "%d", hexString) != EOF){ unsigned short int instruction = (unsigned short)strtol(hexString, NULL, 16); if (instruction >> 12 == 0b0001){ //op code is ADD dr = (instruction >> 9) & 0b111; // turns other bits to zero sr1 = (instruction >> 6) & 0b111; sr2 = (instruction) & 0b111; printf("add r%dr%dr%d", dr, sr1, sr2); } else if (instruction >> 12 == 0b0101){//op code is AND dr = (instruction >> 9) & 0b111; sr1 = (instruction >> 6) & 0b111; sr2 = (instruction) & 0b111; printf("and r%dr%dr%d", dr, sr1, sr2); } } fclose(file); } 

使用gcc编译时没有出现complie错误。

以下是lc3指令集的副本，供参考http://ece224web.groups.et.byu.net/reference/LC3_Instructions.gif