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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}
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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];

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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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 * *    **  **   *     * **  * *** 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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*   ***  *  *** **      *  * ***** ** %s",a,b);
** **         * *    *   * * len = strlen(a);
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 ****      *    * *  **    *   ** *  *** *  *   *****  **

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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];
  ***   *   **  
 *  ****** * ** ** *  **  ***  *  **   *   ****** * ** 
    * *  ***   ****** ***  *  * **  *   
*       * *  *  **   * ***  *    **** *** ***     *   *****  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;
 ** * **  * **  *** * * ** ** **
  ***  ******     *  *  * ***
***  * **       *****    *  ****     *** * **  * *  *  *  *  ******   *** **** ** *  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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