程序代码：

# include <stdio.h>
int main()
{
    int strSub(char * s, int start, int length, char * sSub);
    char c[6];
    int k[6];
    int i;
    printf("请输入六个字母：\n");
    for(i=0;i<6;i++)
        scanf("%c",&c[i]);
    k[i]=int strSub(char * s, int start, int length, char * sSub);
    for(i=0;i<6;i++)
        printf("%c",k[i]);
    return 0;




}
int strSub(char * s, int start, int length, char * sSub)
{
    int i,j;
   
    char c[6],h,b[6];
   
    printf("请选择start的下标（务必小于5）：\n");
    scanf("%d",&start);
    s=&c[start];
    printf("请输入所取字符的长度：\n");
    scanf("%d",&length);
   
    for(i=start,j=0;i<start+length,j<6;i++,j++)
    {
       
        * sSub=* s;
        b[j]=* sSub;
       
        start++;
    }
    return(b[j]);
   
}

k[i]=int strSub(char * c[6], int start, int length, char * sSub);

程序代码：

#include<stdio.h>
int main()
{
   
int strCount(char * s, char * sFind);
int num;
    char str1[100];

char str2[4];

    printf("put in 4 letters string:");
gets(str2);


printf("put in string:"); gets(str1);


num=int strCount(char * str1, char * str2);
printf("%d个",num);
return 0;






}
int strCount(char * s, char * sFind)
{

    char str1[100],str2[4];
    int num=0,i;
s=str1; sFind=str2;


for(i=0; str1[i]!=0;i++)
{ 

    if(*(s+i)==*sFind && *(s+i+1)==*(sFind+1) && *(s+i+2)==*(sFind+2))
        num++;
    }
printf("含有%s字符串",str2);


return(num);


}





一样的错误、、、、

程序代码：

#include<stdio.h>
int main()
{
    char strSub(char * s, char * sSub);
    char s[100],sSub[100],sFind[4];
    printf("请输入一串字符：\n");
    int i;
    for(i=0;i<100;i++)
        scanf("%c",&s[i]);
    printf("请输入你要截取的字符下标：\n");
    int start;
    scanf("%d",&start);
    printf("请输入你要截取的长度：\n");
    int length;
    scanf("%d",&length);
    printf("请输入你要查找的4个字符:\n");
    int j;
    for(j=0;j<4;j++)
        scanf("%s",sFind[j]);
    int k;
    sSub[k]=char strSub(char * s, char * sSub);
    for(k=0;k<100;k++)
        printf("%c",sSub[k]);
    char n;
    n=char strCount(char * s, char * sFind);
    printf("%c",n);
    return 0;
   
    


}
char strSub(char * s, char * sSub)
{
    int i,k;
    int start,length;
    for(i=start,k=0;i<start+length,k<100;i++,k++)
    {
        * (sSub+k)=* (s+i);
    }
    return(sSub[k]);
}
char strCount(char * s, char * sFind)
{
    int j;
    char n;
    for(j=0;j<4;j++)
    {
        if(* sFind==* (s+j)&&* (sFind+1)==*(s+j+1)&&* (sFind+2)==*(s+j+2)&&*(sFind+3)==* (s+j+3))
            n=48+1;
    }
    return(n);
}