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!
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char prefix(char s1[], char s2[])
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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 * **   * * ***** *  **   **
}
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Hidden content!
#include * * * *      *  
#include      * ****  *  

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