Question

下面有一个程序，它只是将用户输入的字符串复制到另一个字符串中。该程序对某些输入工作正常，但对于大字符串的某些输入显示异常。我无法弄清楚。

#include<stdio.h>
int main()
{
    int i, j;
    char s1[100], s2[100];
    printf("Enter a string : \n");
    scanf("%[^\n]%*c", s1);
    for(i=0; s1[i] != '\0'; i++)
    {
        s2[i] = s1[i];
    }
    printf("\n the original string is %s\n", s1);
    printf("\n the string after copying is %s\n", s2);
    return 0;
}

很少有输入实例： -

amitwebhero@AmitKali:~/c programs$ ./a.out
Enter a string : 
hi there..!!

 the original string is hi there..!!

 the string after copying is hi there..!!

这里程序工作正常，但考虑到下面的情况，它在字符串的末尾添加了两个额外的垃圾值。

amitwebhero@AmitKali:~/c programs$ ./a.out
Enter a string : 
my name is amit upadhyay 

 the original string is my name is amit upadhyay

 the string after copying is my name is amit upadhyay�.�4

Answer 1

#include <string.h>
int main( )
{
   char source[ ] = "this is a string" ;
   char target[20]= "" ;
   strcpy ( target, source ); //strcpy( ) function copies contents of one string into another string.
   printf ("\ntarget string = %s", target ) ;
   return 0;
}

C程序将一个字符串复制到其他字符串而不使用库函数

1 个答案: