C语言中字符串的查找

#include "stdio.h"

#include "string.h"

void main()

{

char *foundchar(char s[], char s1);

char s1[5],s2[5],s3[5];

int  i,j=0;

char *p;

gets(s1);

gets(s2);

for(i=0;s1[i]!='\0';i++)

{

p=foundchar(s2,s1[i]);

if((p!=NULL)&&(foundchar(s3,s1[i])==NULL))

s3[j++]=s1[i];

s3[j]='\0';

}

s3[j]='\0';

puts(s1);

puts(s2);

puts(s3);

}

char *foundchar(char s[], char s1)

{

int i;

for(i=0;s[i]!='\0';i++)

if(s[i]==s1)

return &s[i];

return NULL;

}