这是我的输入文件名为test1：
00 READ 9
01 READ 10
02 LOAD 9
03 SUB 10
04 BRNG 7
05 WRIT 9
06 HALT 99
07 WRIT 10
08 HALT 99
09 SET 0
10 SET 0
这些命令应该从用户读取两个值并输出两者中较大的一个。
我使用以下命令在unix上编译：
gcc -Wall -ansi -pedantic -std = c99 computer.c
并且程序编译得很好。
我使用命令运行它：
./ a.out＆lt; TEST1
这是我的头文件名为computer.h：
int dataDump (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand);
int compile (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand);
int execute (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand);
这是我的名为computer.c的源代码文件：
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "computer.h"
int main ()
{
int memory [100] = {0};
int accumulator = 0;
int instructionCounter = 0;
int instructionRegister = 0;
int operationCode = 0;
int operand = 0;
compile(memory, &accumulator, &instructionCounter, &instructionRegister, &operationCode, &operand);
execute(memory, &accumulator, &instructionCounter, &instructionRegister, &operationCode, &operand);
return 0;
}
//This function works correctly
int compile (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand)
{
char word[4];
while ((*operationCode = scanf("%d %s %d", accumulator, word, operand)) > 0)
{
if (strncmp("SET", word, 4) != 0 && *operand > 99)
{
printf("ERROR Word overflow");
exit(1);
}
if (strncmp("SET", word, 4) == 0 && *operand > 9999)
{
printf("ERROR Word overflow");
exit(1);
}
if (strncmp("READ", word, 4) == 0)
memory[*accumulator] = 1000 + *operand;
else if (strncmp("WRIT", word, 4) == 0)
memory[*accumulator] = 1100 + *operand;
else if (strncmp("PRNT", word, 4) == 0)
memory[*accumulator] = 1200 + *operand;
else if (strncmp("LOAD", word, 4) == 0)
memory[*accumulator] = 2000 + *operand;
else if (strncmp("STOR", word, 4) == 0)
memory[*accumulator] = 2100 + *operand;
else if (strncmp("SET", word, 3) == 0)
memory[*accumulator] = *operand;
else if (strncmp("ADD", word, 3) == 0)
memory[*accumulator] = 3000 + *operand;
else if (strncmp("SUB", word, 3) == 0)
memory[*accumulator] = 3100 + *operand;
else if (strncmp("DIV", word, 3) == 0)
memory[*accumulator] = 3200 + *operand;
else if (strncmp("MULT", word, 4) == 0)
memory[*accumulator] = 3300 + *operand;
else if (strncmp("MOD", word, 3) == 0)
memory[*accumulator] = 3400 + *operand;
else if (strncmp("BRAN", word, 4) == 0)
memory[*accumulator] = 4000 + *operand;
else if (strncmp("BRNG", word, 4) == 0)
memory[*accumulator] = 4100 + *operand;
else if (strncmp("BRZR", word, 4) == 0)
memory[*accumulator] = 4200 + *operand;
else if (strncmp("HALT", word, 4) == 0)
{
memory[*accumulator] = 9900 + *operand;
*instructionCounter = 1;
}
// add HALT error and word not found error
}
if (*operationCode == 0)
{
printf("ERROR Undefined use");
exit(1);
}
if (*instructionCounter == 0)
{
printf("ERROR No HALT");
exit(1);
}
return 0;
}
// the bug is in this function
int execute (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand)
{
*accumulator = 0;
*instructionCounter = 0;
*instructionRegister = 0;
*operationCode = 0;
*operand = 0;
for (*instructionCounter = 0; *instructionCounter < 100; *instructionCounter += 1)
{
*instructionRegister = memory[*instructionCounter];
*operationCode = *instructionRegister / 100;
*operand = *instructionRegister % 100;
switch (*operationCode)
{
case 10:
//printf("got here");
scanf("%d", &memory[*operand]); // won't stop to scan in input here
// I even tried putting a space before the %d and it still won't work
// I also tried fflush(stdin) before scanf and it still wouldn't stop
break;
case 11:
printf("%d", memory[*operand]);
break;
case 12:
while (memory[*operand] != 0)
{
if (memory[*operand] / 100 == 10 || (memory[*operand] / 100 >= 65 && memory[*operand] / 100 <= 90))
{
printf("%c", memory[*operand] / 100);
}
else
{
printf("ERROR Unknown Character");
exit(1);
}
if (memory[*operand] % 100 == 10 || (memory[*operand] % 100 >= 65 && memory[*operand] % 100 <= 90))
{
printf("%c", memory[*operand] % 100);
}
else if (memory[*operand] % 100 == 0)
{
break;
}
else
{
printf("ERROR Unknown Character");
exit(1);
}
*operand += 1;
}
break;
case 20:
*accumulator = memory[*operand];
break;
case 21:
memory[*operand] = *accumulator;
break;
case 30:
*accumulator += memory[*operand];
break;
case 31:
*accumulator -= memory[*operand];
break;
case 32:
if (memory[*operand] != 0)
{
*accumulator /= memory[*operand];
}
else
{
printf("ERROR Divide 0");
}
break;
case 33:
*accumulator *= memory[*operand];
break;
case 34:
if (memory[*operand] != 0)
{
*accumulator %= memory[*operand];
}
else
{
printf("ERROR Divide 0");
}
break;
case 40:
*instructionCounter = memory[*operand] - 1;
break;
case 41:
if (*accumulator < 0)
{
*instructionCounter = memory[*operand] - 1;
}
break;
case 42:
if (*accumulator == 0)
{
*instructionCounter = memory[*operand] - 1;
}
break;
case 99:
dataDump(memory, accumulator, instructionCounter, instructionRegister, operationCode, operand);
return 0;
break;
default:
printf("ERROR Unknown command");
exit(1);
break;
}
}
return 0;
}
//This function works correctly
int dataDump (int memory [], int* accumulator, int* instructionCounter, int* instructionRegister, int* operationCode, int* operand)
{
printf("\nREGISTERS:\n");
printf("%-25s%+05d\n", "accumulator", *accumulator);
printf("%-28s%02d\n","instructionCounter", *instructionCounter);
printf("%-25s%+05d\n","instructionRegister", *instructionRegister);
printf("%-28s%02d\n","operationCode", *operationCode);
printf("%-28s%02d\n", "operand", *operand);
printf("MEMORY:\n ");
for(*accumulator = 0; *accumulator <= 9; *accumulator += 1)
{
printf("%5d ", *accumulator);
}
for(*accumulator = 0; *accumulator < 100; *accumulator += 1)
{
if(*accumulator % 10 == 0)
printf("\n%2d ", *accumulator);
printf("%+05d ", memory[*accumulator]);
}
printf("\n");
return 0;
}
这是输出：
0
REGISTERS:
accumulator +0000
instructionCounter 06
instructionRegister +9999
operationCode 99
operand 99
MEMORY:
0 1 2 3 4 5 6 7 8 9
0 +1009 +1010 +2009 +3110 +4107 +1109 +9999 +1110 +9999 +0000
10 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
20 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
30 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
40 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
50 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
60 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
70 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
80 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
90 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000 +0000
答案 0 :(得分：0)
如果我理解正确，compile()应该阅读＆＃39;程序＆＃39;从文件中，execute()应该运行所述程序。您面临的问题是execute()应该从用户那里获得输入，而scanf不会要求输入。
如果是这种情况，那么您所遵循的行为是可取的。您正在使用输入重定向（./a.out < test1）从文件中获取数据，因此，当您希望scanf获取用户输入时，它会再次尝试从文件中读取并向用户询问否输入。检查是否是这种情况，您可以在printf之后scanf查看内容。
要解决此问题，您应该使用文件访问权限fopen()，fclose()，fscanf()，fprintf()等来解决此问题，而不是使用输入重定向来读取文件。 ..）。将文件名作为命令行参数（./a.out test1）传递，然后使用argv[]检索它。从文件中读取您所需要的内容。一旦用户需要输入数据，请使用scanf()，现在可以从控制台正确读取。