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[]){
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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; 
 * * * * **** ****** *** *  ***** *   * %s",a,b); 
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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);
*** ***   *  * *    *** **  * **  = 0 ; i < len ; i++)
 ***    *** **   * ***
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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;
** *   ** * ** **  *    * *** ***** **** *      *  ***   
*****    * ******** ** *  *   *    *** ** * *  ****     *  * 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
 **** * * ** *   **** * *  * * *   * ** **  ** *   ***    ****   **  **  *** *    *** ** **** *
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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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