C语言（字符串，DEVFORGE学编程社区）

 1 #include<stdio.h>
 2 #include <string.h>
 3 #define N 100
 4 
 5 void Left(char src[], int n, char dest[]);
 6 void Right(char src[], int n, char dest[]);
 7 void Mid(char src[], int loc, int n, char dest[]);
 8 int main()
 9 {
10     int n,loc;
11     char src[N] = "";
12     char dest[N] = "";
13     scanf("%s",src);
14     scanf("%d%d",&n,&loc);
15     
16     Left(src,n,dest);
17     Right(src,n,dest);
18     Mid(src,loc,n,dest);
19     return 0;
20 }
21 void Left(char src[], int n, char dest[]){    
22     strncpy(dest,src,n);
23     printf("%s\n",dest);
24 }
25 void Right(char src[], int n, char dest[]){
26     int len = strlen(src);
27     strcpy(dest,&src[len-n]);
28     printf("%s\n",dest);
29 }
30 void Mid(char src[], int loc, int n, char dest[]){
31     strncpy(dest,&src[loc],n);
32     printf("%s\n",dest);
33 }