1-11 Exercise 3: Prefix of a string

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A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include *** * ***    *  
#include    *  *  **

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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}
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Hidden content!
#include *    ** * *  * ** 
#include  *** *    *

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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  ** *** **  *       * *    ****    **** * *     ****   ***  **** * * ** *   * *

 * ***     **********    *   *  ** ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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   * * * * **    *   * ***  b[100];

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*   *  ***  *    * * * * * 
}
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Hidden content!
#include *   *  **   ***   
#include ** * **        

int main() 
{ 
   *  *** *** ** ** *   * a[100],b[100]; 
  ***  **   ** * * * *     * *  i,j,prefix = 1; 
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 ***** * * *    *    * ** ****   len = strlen(a); 
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**   ******  *   **  **  **   *      0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include *     * *   * * **
#include  * ** *   **  *   

int main()
{
 *  **   **** ***  *  * ****    a[100],b[100];
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 * ** **  *  *  * **  ***   ** * *** %s",a,b);
**    * **  ** ***** * * ***   * len = strlen(a);
 * **   *      *** * * **  *  = 0 ; i < len ; i++)
**  *   **** * * * **  * **
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**  * ** **  *  ****      **   *  * **   ***   *  * * ** ** **
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   *    **  * * *  *** ***  * ***  **   ****       *****  ***** * *     is a prefix of %s",a,b);


** ** *   ** **    **   ***** * *   0;
}
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Hidden content!
#include  *  ****  ***** 
#include    **   * ** **

int prefix(const char *pre, const char *str)
{

*    *  ** **** *   *   **   *  * ** *  ** * 
  * * ** *  *** * *  **     *   **   *   **     *     ** * *  0;
  * *****  *   **** ***      *  *****   ** * *****
** * *****  * *  *  **    **  *** *        * ****    * * 1;
*    ****    * **   ** *  * **    return 0;


}

int main()
{
  **   ***   ***    *****  **  pre[100],str[100];
  * ** ***** ** ***  * **  
**  ** *** *  ****** * ** ****  *    ***  *** ****   **   *  
**  * ** *  *** *  ** **    ** ****  *
**  *** *** * *****  ** ****   ** ****     **   ****     *   *  **** is a prefix of %s",pre,str);
*** *    ** *    **  * *  *  
** * *  ***** **  ***  **   ** *   *   *****   *** *  **  *   **  is not a prefix of %s",pre,str);
**   * *  * * * **  * **** * ** *  *    0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
** *  *   **  ** ******  c;
****  * ** *     *****  *   ** *    * ** * * * 
** ** *   ***    ***     ***   ** **  ***  ** * *  *** ****    ** 0;
 *    **  *       ** ** *  * *
 ***   ****** ** *  *   **
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   **  **  *    *  *** * ** *   **   **** * *  * *** **** *   * *  *******  *  * ***   *  **  *
*  *  *    **** *** * *     * **** ****   **  ** * ** **    * ***** **      **    *******     **  ***   * 0;
  * *   ******  ***    **  * * * **  *  *    * * ** * ****
 ***   ***      **  *  **** * ** *    **  *  *    *  1;
    }
}

int main(){
 *   **** *  *    * ********* ** a[100],b[100];
****** **  **  * *  ******* *    ** * *  %s",a,b);
* * * ** **   * * *   ** *  **    *
 **     * *  * *  ***  **  * * *** *     * *  *****   * * *  **** is a prefix of %s",a,b);
** * **** *   ***       * ****
 ****  **   * **   *     ** * *   ******    **  * *  **     *** **   is not a prefix of %s",a,b);
*   ***   *****  * ** ** *  ******* 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
*****   *       * ** *** *  * p[100],s[100],a[100]={};
 *  *       *  ****** ** *  t;
  **    *** * *  ***  * ** **  ** **** ***  *
* * ** * ** ***  ** ** * ***** *  *  **   *
 *  * * *** **** **  ** * *****  * **  %s",p,s);
             ********* * **  **  *
* *   * * * * *   * *****  ***  ******   * 
     * ***    **    *** * **    * *** 
 **  **  * * *  * ***     **   * **** **** **
***    **    **      ****   ****
   *   **** ***   *  *  ***    *   *** * * * *    ** ** **   * * *  is a prefix of %s",p,s);
* * ** *  **** * ****       *
    ** *    ***** * ******   *
        * **  ***  *** * *   *    *  **  * *** ** ***  **   *  *  is not a prefix of %s",p,s);
** *  **         ******* ***  **
 * **  ***  ***  * ***  ***  *   0;
}
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