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[]){
* *    *   **   * * *  **  * * 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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 ** *** **  *  *  ***  * *
}
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Hidden content!
#include **** * **   *** * 
#include *    *   ** *** 

int main() 
{ 
***   ** *  ** *     *** ** *  a[100],b[100]; 
***   ** * * **  *** ** * ** i,j,prefix = 1; 
   ** *** *  ** ***    * ***  **  ***  %s",a,b); 
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    *** * **  *** **      * **  *  = 0 ; i < len ; i++) 
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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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0 0
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);
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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;
 ** * ** ***    *    * * *
** * * *  *  *** **** * ** 
  **** ** ** **     * * *** *   *** **  *  ** ***   *       *  *  *       **    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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