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[])
 {
 int i;
 int length;
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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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0 0
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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**  * * * * *  * *  *  * * *       *  %s",a,b);
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 **   *   *    * **  **** * * *  *  ** *  * **      **
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**  ***     **   **  **  ** **  **   ***      ** *** * **  *  * * * *  **  *  ******  * *   is not a prefix of %s",a,b);
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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;
 ** ** ***** ** * **  * *  * ***   ***        **  **
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* * * * *  * ** * ** * ** return 0;


}

int main()
{
  *       **   *  * * ** pre[100],str[100];
**  * *  **  ***** * *
 *  *** ***** **  *   * * *****  *   * * *  * *****
  *        * **** * ** ***     ***       **
  ** ** *  *    ****  * * * **   ***  **  *** ** **  ** * **  * * *** 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;
    *   *  ***    **** **  * 
 *        *  *   **********  
* *  *** * *** * *   **   **  *  **  *****    *  ** **   * *  **  *** *   *****  ***    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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