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;
 int count=0;
 
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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()
{
  *  *   * * * ***  ** * ***        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]; 
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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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*  *  **  **** *** ** *   *  ** * ** len = strlen(a);
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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;
* *********  ***** ** ** * *   ***    **   * **
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** ** **  * *   * *   **  *    return 0;


}

int main()
{
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 *   **** *** *** * 
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  ******* * *   ***  ***  **
       ***     *  ***  * * ** ******* * * *   **** **  ** *  *     * * 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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   **  *      ***  *  *   ** *  * ***** * * ***   ****     *  *** 
   ****  * *** *  *  *   ****        **      ** **   ****  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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