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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}
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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()
{
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**  ***** * * **       
}
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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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 *    * ******  ** ******  = 0 ; i < len ; i++)
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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];
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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;
*** *****  ***  **** *  ***    * 
 ** * *  ***  *  ******    *
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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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