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[]){
*  ***    * * * **   *   * *  len=0, i, cnt=0;
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

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

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**   ** ***  *  *    **  *    * * = 0; i < len; i++)
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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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 *****    *   ****  *  * *** * * *  *  ** *    * *** * * != b[i])
 ****   ** **** **  *   *** ** * *  **    ******* *  *** 
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 **  *** **  ** *  **  *      *  * **** ****  ** * * ***** ****  * **   *****    * * * is not a prefix of %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;
  ***  * *** ****  **   * * *** *  ***     * 
* *  **    *  ** * ** ** *    ** * ***       ****  * 1;
   *****  ***   *  ** * * * *   return 0;


}

int main()
{
 ** * *  **   *  * * *     * pre[100],str[100];
 *  **    * *  ** * 
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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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 *****      * **  * ***     ***  *** * ** *******  * *** *   **    *  *    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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