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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*  *  **  ***  *   * ** ***   * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
**       *   * * * *** *  *** * * a[100];

* **** * * *  ***  * * ** *   b[100];

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**  *** ***   *   **    ** *** 
}
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Hidden content!
#include * ** ****  ** ***  
#include ***  *    ****** *  

int main() 
{ 
***** **  ** ***    *   ** * **   ***  a[100],b[100]; 
   *    *  *    * *  * *  i,j,prefix = 1; 
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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;
*  * *** **     *  *   *    *** *     ** * *  ***  *  
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  *    *** **   * *   **    return 0;


}

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