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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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];
*  * * ** ** **   ***** *   i,j,prefix = 1;
*   ** *   * ** * *   *  * *      * * %s",a,b);
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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];
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  * *** *  *  *** *      * ** *   *     *  ** *
  ******  ****** *  *  ***    * *  **   ** ** * ***  * *   ***  * *  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;
    * **  *  **  *  
**** * * ******* ***    * *   
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*   ****** ** * ***   *   *  * *  * * *     *** * **    *    **   * * *** ***  **** ****
   ***  *** ****** ****** *    ** **** **  *   *   **  * *** **    * *  **  * ** * *  * *** ** *  *    *    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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