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

int prefix (char st1[],char st2[]){
*    ** * * * * ***  *  * len=0, i, cnt=0;
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*  * ** ** **    ** ** * *****   0;
}
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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()
{
 **     ** *     *   *  *   a[100];

  **  *    * **   **    ** **  b[100];

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 * ** * * * *    ** *** ****  **  * **** *  *  a, b);

***   * **  *** **  * ***  len = strlen(a);

*** *** **    **    *** *  *    = 0; i < len; i++)
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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];
* *   *****  *  *   *** i,j,prefix = 1;
 * *** * * **   *    *  ****      * * *    %s",a,b);
   **  *    * *  * *   *      ** len = strlen(a);
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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];
* *  *****  *  ***    * **
*   *   ** ** *   ** * * **** ******* ** *   * 
  * *  *  * ****      * ** **     *   *
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 *   ****     * ******  *    
 * *        *** * ****** ******* *****  *  **  * ******  * * **   * *   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;
    ** **  *  * ****      *   ********  **  ** * ** * *
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  ***   ** ***** *  * ** * ** 
***** *** * *   ** **  * * * ***
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  **     *** *         *  ** *  ***   *  *** * ** 
*** ****  **         ***  ** ** * *  * **      * **  *  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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