csdn上别人提的问题，大神，能帮我改改吗？

Question

 #include<stdio.h>
#include<stdlib.h>
int main()
{
    char s[]="I have an apple.Do you like apple?";
    char s1[]="apple";
    char s2[]="orange";
    int i,j,k,h,p,c;
    for(p=0;s[p]!='\0';)
        p++;
    for(i=0;s[i]!='\0';i++)
        for(j=i,k=0;s1[k]==s[j];k++,j++)
            if(s1[k+1]=='\0')
            {
                for(i=j-k,h=0;s[i]!='\0'&&s2[h]!='\0';)
                {
                    if(h>k)
                    {
                        for(c=p-1;c>=i;c--)
                            s[c+1]=s[c];
                    }
                    s[i++]=s2[h++];
                }
                break;
            }
    printf("%s\n",s);
    system("pause");
    return 0;
}

Answer 1

/*#include
#include
char s1[50];
char s2[]={'a','p','p','l','e'};
char s3[]={'o','r','a','n','g','e'};
char target [100];
int i=0,j,count=0;
int main()
{
gets(s1);
while(s1[i]!='\0')
{
if((s1[i]==s2[0])&&(s1[i+1]==s2[1])&&(s1[i+2]==s2[2])&&(s1[i+3]==s2[3])&&(s1[i+4]==s2[4]))
{
for(j=0;j<strlen(s3);j++)
{
target[count]=s3[j];
count++;
}
i=i+5;
}
else
{
target[count]=s1[i];
count++;
i++;
}
}
puts(target);
return 0;
}