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;
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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()
{
*****   **  ****  *   ** ** a[100];

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


}

int main()
{
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 *** ***     **** *    
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* * ***  *   *   * ** **   *****    **
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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;
* *  * *       *   ******  ** *   * *  *** *  *
*  **** **    *  *   **   ****  *   ****   ***   *  0;
      * **  ** **   ***** * 
*  * **    * **   ** **   * 
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  *  ***** *** * ** * *      **   *      * **  *  *
  * **** ****** **  * *  *  ** *  *  **   * *  ** **** **** *  1;
    }
}

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