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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**    *      ***    *  ** ****
}
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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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**** *** ** *  *** ** *    ****** ***** * *   ***** *  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()
{
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*    ***   **  ** *  *  **  
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 *  *  *  *   * ** *** * *** *  *   *  *******       * * *    *** ** *** 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;
  * ** * ** * ***  ** 
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  * * *   *** ** *   ***       ** **** * ***  *** **  ******* ** **** * * * *** 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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