strncpy和strcpy

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <math.h>
 4 #include <algorithm>
 5 #include <iostream>
 6 #include <ctype.h>
 7 #include <iomanip>
 8 #include <queue>
 9 #include <stdlib.h>
10 using namespace std;
11 
12 char s[100][100],a[100],b[100],c[100]; 
13 
14 int main()
15 {
16     int i=0,j;
17     for(int i=0;i<1;i++){
18         scanf("%s",&a[i]);
19         strcpy(s[i],a);
20     }
21     for(int j=0;j<1;j++){
22         for(int k=1;k<strlen(s[j]);k++){
23          strncpy(b,s[j],k);
24          b[k]=‘\0‘;
25          strcpy(c,s[j]+k);
26          cout<<s[j]<<" "<<b<<" "<<c<<endl;
27     }
28    }
29 }

1 char *strcpy(char *Dest , const char *Src)  
2 {  
3     assert((Dest != NULL) && (Src != NULL));  
4     char *address = Dest;  
5     while((*Dest++ = *Src++) != ‘\0‘)  
6         NULL;  
7     return address;  
8 }  

1 char *strncpy(char *strDest , const char *strSrc , int n)  
2 {  
3     assert((strDest != NULL) && (strSrc != NULL));  
4     char *address = strDest;  
5     while(n-- > 0)  
6         *strDest++ = *strSrc++;  
7     return address;  
8 }