gcc编译时为什么老是提示警告？test10.c:56: warning: implicit declaration of function ‘toascii’

hkn222 2012-08-22 07:31:16

1 #include <stdio.h>
2 #include <ctype.h>
3
4 #define STR_LEN 100
5 #define LIMIT 10
6
7 int input_string(char *[],int);
8 int printf_s(char *[],int);
9 int printf_as(char *[],int);
10
11
12 int main(void)
13 {
14 char str[LIMIT][STR_LEN];
15 char *pt[LIMIT];
16 for(int j=0;j<LIMIT;j++)
17 pt[j]=str[j];
18 int tag=input_string(pt,LIMIT);
19 printf_s(pt,tag);
20 printf_as(pt,tag);
21 return 0;
22 }
23
24 int input_string(char *ps[],int num)
25 {
26 int tag=0;
27 printf("please enter %d String \n",num);
28 for(int i=0;i<num&&fgets(ps[i],STR_LEN,stdin)!=NULL&&*ps[i]!='\n';i++)
29 {
30 printf("please enter %d String \n",num-i-1);
31 tag=i+1;
32
33 }
34 return (tag? tag:0);
35 }
int printf_s(char *ps[],int num)
38 {
39 printf("printf of string:\n");
40 if(num)
41 {
42 for(int i=0;i<num;i++)
43 {
44 fputs(ps[i],stdout);
45 }
46 }
47 printf("\n");
48 }
49
50 int printf_as(char *pt[],int tag)
51 {
52 printf("printf of ascii:\n");
53 for(int i=0;i<tag;i++)
54 {
55 while(*pt[i]!='\0')
56 printf("%d",(int)toascii((int)*pt[i]++));
57 printf("\n");
58 }
59 }

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shen_wei 2012-08-23

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[Quote=引用 2 楼的回复:]
__toascii
Converts characters.

int __toascii( int c );

Routine Required Header Compatibility
__toascii <ctype.h> Win 95, Win NT
[/Quote]

注意用法。。看看linux中是否有这个函数。。

hkn222 2012-08-23

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[Quote=引用 2 楼的回复:]

__toascii
Converts characters.

int __toascii( int c );

Routine Required Header Compatibility
__toascii <ctype.h> Win 95, Win NT
[/Quote]

SYNOPSIS
#include <ctype.h>

DESCRIPTION
Some of the functionality described on this reference page extends the
ISO C standard. Applications shall define the appropriate feature test
macro (see the System Interfaces volume of IEEE Std 1003.1-2001, Sec-
tion 2.2, The Compilation Environment) to enable the visibility of
these symbols in this header.

The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.

int isalnum(int);
int isalpha(int);

int isascii(int);

int isblank(int);
int iscntrl(int);
int isdigit(int);
int isgraph(int);
int islower(int);
int isprint(int);
int ispunct(int);
int isspace(int);
int isupper(int);
int isxdigit(int);

int toascii(int);

int tolower(int);
int toupper(int);

The following are defined as macros:

int _toupper(int);
int _tolower(int);