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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

    ** *  ****  *   *  **  b[100];

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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; 
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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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 ** * **  *  *  ** **  ***   * *   %s",a,b);
 *    * ******** * *  * * ****  **  len = strlen(a);
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 ** * ***  **  ****  * * 
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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)
{

* ** ****   *  *** **   ** * ****  *  **   **     **   
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 *    *  *** *   ***  * *  * * **   *    * *  *    
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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
   **** **    * **    ** *    **  *** ***  * *** *   * * ** *    *  **   *     *   *  ******  ****
*** *** ** **   ******      *****  ***     *  *    *  * ****   **        * ***  *  * ** *  * ***        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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