errors:conflicting types and previous declaration of xxx was here
 

hello,
i try to compile a .c file and it always appears this error:

argouments.c:8: error: conflicting types for \u2018key_t\u2019
/usr/include/sys/types.h:123: error: previous declaration of \u2018key_t\u2019 was here

i cant find out where is the problem!!!!the code is

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct{
char *word;
int count;
}key_t;


int getword(char *word,FILE *inp);
int binsearch(char *word,key_t tab[],int n);

int getword(char *word,FILE *inp)
{
return (fscanf(inp,"%s",word));
}

int binsearch(char *word,key_t keytab[],int n)
{
int cond;
int low,mid,high;

low=0;
high=n-1;
while(low<=high)
{
mid=(high+low)/2;
if((cond=strcmp(word,keytab[mid].word))<0)
high=mid-1;
else if (cond>0)
low=mid+1;
else
return mid;
}
return -1;
}

key_t keytab[]={
"auto", 0,
"break", 0,
"case", 0,
};
int main(int argc,char *argv[])
{
int n;
char word[1000];
FILE *finp;

int NKEYS;
if(argc!=2)
{
printf("error in the use of the programe");
exit(-1);
}

finp=fopen(argv[argc-1],"r");
if(finp==NULL)
{
error();
}
while(getword(word,finp)!=EOF)
{
if(isalpha(word[0]))
{
if((n=binsearch(word,keytab,NKEYS))>=0)
{
keytab[n].count++;
}
}
}

for(n=0;n<NKEYS;n++)
if(keytab[n].count>0)
{
printf("%4d %s\n",keytab[n].count,keytab[n].word);
}
fclose(finp);
return 0;
}


please let me know if you can help me to compile this programe!!

The name "key_t" is already used in the system headers. You should modify your code and instead of using key_t you should use something like "my_key_t".

Also, please write the code between code tags like :

[ code ]
...
[ /code ]

(without the spaces between the parenthesis and code).

It will look like:

and preserve formatting.