2013-10-15 179 views
0

我的程序由於某種原因沒有編譯。我有2個C文件,我編譯它們以下列方式:gcc showxbits.c xbits.c -o showxbits -lm。而且,我得到以下錯誤:無法編譯C文件

showxbits.c: In function ‘main’: 
showxbits.c:18:3: warning: incompatible implicit declaration of built-in function ‘strcpy’ [enabled by default] 

我的第一個文件名爲XBITS,它下面是:

/* 
* stubs for functions to study 
* integer-hex conversions 
* 
*/ 

#include <stdio.h> 
#include <math.h> 
#include "xbits.h" 
/*#include "/home/carl/Programs/C/lab2/cheungr/hw2/solution/reverse.c" 
/* function represents the int n as a hexstring which it places in the 
hexstring array */ 



void itox(char hexstring[], int n) { 
    hexstring[2*sizeof(n) + 1]; 
    int ratio, remainder; 
    int i = 0; 
    while(ratio != 0) 
    { 

     ratio = n/16; 
     remainder = n % 16; 
     if (remainder == 10){ 
      hexstring[i] = 'A'; 
      i++; 
     } 
     else if (remainder == 11){ 
      hexstring[i] = 'B'; 
      i++; 
     } 
     else if (remainder == 12){ 
         hexstring[i] = 'C'; 
      i++; 
       } 
     else if (remainder == 13){ 
         hexstring[i] = 'D'; 
      i++; 
       } 
     else if (remainder == 14){ 
         hexstring[i] = 'E'; 
        i++; 
     } 
     else if (remainder == 15){ 
         hexstring[i] = 'F'; 
        i++; 
     } 
     else 
      hexstring[i] = remainder; 

    } 
    i++; 
    hexstring[i] = '\0'; 
    printf("in itox, processing %d\n",n); 
} 

/* function converts hexstring array to equivalent integer value */ 

int xtoi(char hexstring[]) { 
    int i, integer; 
    int length = strlen1(hexstring); 
    for (i = length-2 ; i >= 0 ; i--) 
    { 
     integer += (int) pow((float) hexstring[i] , (float) i); 
    } 
    /*printf("in xtoi, processing %s\n", hexstring);*/ 
    return integer; 
} 

int strlen1 (char line[]) 
{ 
     int i; 

     i=0; 
     while (line[i]) 
       ++i; 
     return i; 
} 

和我的第二個文件是如下:

/* 
* stub driver for functions to study integer-hex conversions 
* 
*/ 

#include <stdio.h> 
#include "xbits.h" 

#define ENOUGH_SPACE 1 /* not really enough space */ 

int main() { 
    char hexstring[ENOUGH_SPACE]; 
    int m=0, n = 0x79FEB220; 
    itox(hexstring, n); 


    /* for stub testing: create a fake input string */ 
    strcpy(hexstring, "6BCD7890"); 
    m= xtoi(hexstring); 

    printf("\t%12d %s %12d\n", n,hexstring, m); 

    return 0; /* everything is just fine */ 
} 
+0

你有什麼錯誤?警告不會失敗編譯 – tristan

+1

每當您第一次使用庫函數時,對Google'man function_name'來說是很好的選擇。不僅有助於教您如何使用函數本身,還可以引導您包含正確的頭文件集,這是BTW正確使用庫函數的一部分。 – smRaj

+0

使用字符串函數時,請添加#include 頭文件。 – vkulkarni

回答

5

#include <string.h>在你的程序。在該頭文件中聲明與strcpy()等字符串相關的函數。