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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 * *  ** * **    **   ***** 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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 *  ** **  ********** * * * **
}
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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];
***    * ***  ** * **   **   *** i,j,prefix = 1;
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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;
*** * *      * *    * ** * *  * ** **     * 
  **  * ******  ** **  **  ****** ** *****   * ***  **     0;
 *         *  *  ***** * *
  * ******* * *** *  * **      *
   *****  * **  *   **** * ** **  * *   *     * * *   ** ** **    * *** * *****    of a string
      **  *  *    * ** ** * ** ** ***** ****      * ** *   *      ** *  *********  **** 
 *  ****  ** * *  *  *  ***  ***** * ***      * *  * *  * ***    * *  *  * *   *******     * * ****  * *** 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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