ch27-4.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include <stdio.h> 
#include <string.h>
#include <ctype.h> 

copystr(p1,p2,m) 
char *p1,*p2; 
int m; 
{ 
   int n; 
   n=0; 
   while(n<=m-1) 
   { 
      n++; 
      p1++;
   } 
   while(*p1!='\0') 
   { 
      *p2=*p1; 
      p1++; 
      p2++; 
   } 
   *p2='\0';
} 

void main() 
{ 
   unsigned m; 
   char str1[80],str2[80]; 
   printf("Input a string(length<80:"); 
   scanf("%s",str1); 
   printf("\nWhich character starting from?"); 
   scanf("%d",&m); 
   if(strlen(str1)<m) 
      printf("\nError input !"); 
   else 
   { 
      copystr(str1,str2,m); 
      printf("\nResult is : %s",str2); 
   } 
   m=0;
}