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()
{
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 * **     ***  ** ** * ** *   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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 ***  *   *   * * * ***  len = strlen(a); 
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***  ***  * * ***  * * * ***   ** **  ***    ********   *    is a prefix of %s",a,b); 

 
  *  * *   ******   * *        ** 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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* *** *   **** *     ***  **  0;
}
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Hidden content!
#include  ****   ******  
#include * *   * * * * *

int prefix(const char *pre, const char *str)
{

 **   ******  * * **    ****  **  *   **  *  ** *   * ***
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** * *** *      **  **  * * *     return 0;


}

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