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