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[])
 {
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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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*  ***   * * ** **  *   *  *  *   * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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 *    **    ** * * * *   *  * *
}
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Hidden content!
#include *   *  *   * * 
#include   **  *   ***  * 

int main() 
{ 
**        * * ** **   **    ** a[100],b[100]; 
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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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 *  ****   *  **** *  *   *** **    ** * **     ** **   * * * *    ***** *   = 0;
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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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