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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*  ***  * * * * ******* *******   0;
}
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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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****  * * ***  *  * **  * 
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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;
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 ***   **   * *  ** ** *   len = strlen(a);
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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()
{
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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;
**** ** ***  *     ******* 
 * * * ****** *** * *    *******
*   *** * **   *****  *    *      ** **** ***   *   *        ** **  * ** **  * 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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