c - 编写一个C程序，使用for循环从字符串中提取字符串的一部分

Question

#include<stdio.h>
#include<string.h>
void main()
{
char str1[50],str2[50];
int i,j,n,m,l;
clrscr();
printf("Enter the string\n");
gets(str1); //scanf ("%s",str1);
printf("Enter the position of the required character: ");
scanf("%d",&n);
printf("Enter the required number of characters to be extracted: ");
scanf("%d",&m);
l=strlen(str1);
if(m+n-1<l)
 {
  for(i=n-1;i<m+n-1;i++)
   {
    for(j=0;j<i;j++)
    {
     str2[j]=str1[i];
     str2[j]='\0';
    }
   }
printf ("The extracted string is: %s",str2);
 }
else
printf ("string extraction is not possible");
}

预期输出

Enter the string : UNIVERSITY IN BANGALORE

Enter the position of the required character: 6

Enter the required number of characters to be extracted: 4

The extracted string is: SITY

Answer 1

package exatractstring;

import java.util.Scanner;


public class ExatractString {


    public static void main(String[] args)
    {
        String str;
        int begin,end;
        Scanner s = new Scanner(System.in);
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a String : ");
        str = s.nextLine();
        int sizeString  = str.length();

        System.out.println("Enter Extract Begining Position : ");
        begin = sc.nextInt();
        System.out.println("Enter Extract end Position : ");
        end = sc.nextInt();
        if(begin < 0 || end>sizeString )
        {
            System.out.println("You are wrong ..!!!");
        }
        System.out.println(str.substring(begin,end));
    }

}