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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 int length;
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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()
{
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*** *     ******* *       ** * * 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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** ***  ** **   * ** * * ** * 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()
{
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** * ****  * *  ** * *** * * 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;
********* ** *  *   ****** * 
*     *  ** **   **   ** ** ** 
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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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