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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 *** ***   *  *  * * * ** * ** = 0; i < len; i++)
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** * *******  * *  *  * *   *  **   ***      * ***     *   * ** * *        is a prefix of %s", a, b);

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

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