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!
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char prefix(char s1[], char s2[])
 {
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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**** *  * *** * * * **** **  
}
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Hidden content!
#include  ** * * *     
#include      *  *  * *  

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