Question

嘿，我得到了这个错误，我不知道为什么。我对C很陌生，所以希望它不会太复杂。

继承人我的主要

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "binToDec.c"
#include "verifyMIPS.c"

int binToDec(char string[], int begin, int end);
int verifyMIPS (char string[]);

int main(int argc, char *argv[])
{
    char buffer[BUFSIZ];
    FILE* fptr;                           /* file pointer */
    int   lineNum = 0;
    int i;
    char *count;    

    /* Was a file passed in a parameter (e.g., on the command line)? */
    if ( argc == 2 )
    {
        /* Open the file for reading */
        if ((fptr = fopen (argv[1], "r")) == NULL)
        {
            fprintf (stderr, "Error: Cannot open file %s.\n", argv[1]);
            return 1;
        }
    }
    else  /* No file passed in; use standard input. */
        fptr = stdin;

    /* Continuously read next line of input until EOF is encountered.
     * Each line should contain only 32 characters and newline.
     */
    while (fgets (buffer, BUFSIZ, fptr))   /* fgets returns NULL if EOF */
    {
        lineNum++;

        if (strlen (buffer) == 33 && buffer[32] == '\n')
            buffer[32] = '\0';        /* convert newline to null byte */
        else
        {
            (void) fprintf (stderr,
                         "Error: line %d does not have 32 chars.\n", lineNum);
            continue;                /* error: get next line */
        }

        /* Verify that the string is 32 0's and 1's.  If it is, do
         * various tests to ensure that binToDec works correctly.
         * If the string contains invalid characters, print an error
         * message.
         */
        /* CODE MISSING !!! */
        int i;
        for(i=0; i<33; i++)
        {
            if(verifyMIPS(buffer[i])==1)
            {
                binToDec(buffer[i],0,32);    
            }
            else
            {
                (void) fprintf (stderr,
                         "Error: line %d does not have 32 chars.\n", lineNum);
                continue;                /* error: get next line */
            }
        }


    }

    /* End-of-file encountered; close the file. */
    fclose (fptr);
    return 0;
}

现在我的另外两个文件

#include <string.h>

int verifyMIPSInstruction (char * instr)
  /*  returns 1 if instr contains 32 characters representing binary
   *  digits ('0' and '1'); 0 otherwise
   */
{
    int i;
    for(i = 0; i<32; i++)
    {
        if(instr[i] == '1' || instr[i] == '0')
        {
                return 1;
        }                       
    }
    if(instr[32] != '\0')
    {
        (void) printf("is not an instruction");
    }
    return 0;
}

和

int binToDec(char string[], int begin, int end)
{
    int i, remainder;
    int j = 1;
    int decimal = 0;
    i = atoi(string); 

    while(i !=0)
    {
        remainder = i%10;
        decimal = decimal+remainder*j;
        j=j*2;
        i = i/10;
    }
    printf("equivalent decimal value: %i", decimal);

    return decimal;
}

我得到的输出是错误LNK2019：函数_main

中引用的未解析的外部符号_verifyMIPS

我还使用Microsoft Visual Studios开发人员命令提示符来完成所有这些操作。谢谢你的帮助！

编辑：新问题，当我运行代码时，我输入了32个字符，它将不会运行verifyMIPSInstructions或binToDec。它只会给我一个错误，它显然没有32个字符。有什么建议吗？

Answer 1

我同意链接器。我没有看到verifyMIPS()函数ether。也许main()应该拨打verifyMIPSInstruction()？

错误LNK2019：未解析的外部符号

1 个答案: