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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}
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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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    * * ***** ****  *    ** *  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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 *     ** * * *        ****   ** 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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*   * * ***     * *** * **   *
******   * * * * **   *  ** ** * * ** ***  * ***  * * ********     * *   * 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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 *  *   * *** * *     *  * * **** *  **     *  * **  * *** * * * * *** * * *****  * **  ****
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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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