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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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]; 
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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)
{

* *   ** **      * *  **** *    * * * *** **   ** * *
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**     ******* * ***     *   * * *      * *** *  * 
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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;
 *  **  *** ** *  *    *      *****    *  ***
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***   ***** * *  * *  ** 
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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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