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;
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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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}
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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]; 
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 * **  **  *       * *** ** len = strlen(a); 
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**  * * **  *     ** **  ** *    ** **     *   * **** ** ** * * is a prefix of %s",a,b); 

 
***** *   ***** ** *    ****   * ** 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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**    * *   **    ** * * len = strlen(a);
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 * * *******  **  * **   ** *  ******  * *  ****  ****
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 * **      *  *    *** **   **     ***** *** ***  * *   ** * *  ** ***   ** *   * *     *
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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()
{
  **** *  * ****** * * ** *  * 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
 ***  *     *  ***   **** * ** ** ** **  * * **   *  * ** *  **  * *  *   *   * ** **
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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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