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[]){
**     * *   **  ** *** * *   len=0, i, cnt=0;
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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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}
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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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****  **** **  *      **  * *  ** *        *   *   *  ** ** *   *** **   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];
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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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  **     ** * *  *   **** * *** **
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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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****** *  ****      *   ** **** ***** ****** **  *****    **  * *  *  *  ** *  * ****    *
*   ****  ** ****  **** *  *     ** *     * *   **** ****    *****  **   * ** ***  ***    *    *   *  *  **    *  *  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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