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;
 int count=0;
 
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}
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Hidden content!
#include *******  *  *** *
#include * * *** * ** **

int prefix (char st1[],char st2[]){
   ****      *** ** ****** *  len=0, i, cnt=0;
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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()
{
   **  **  ** *** *    ***     a[100];

* * ** * * * * **  ** ****  b[100];

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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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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];
 *  * *   ** * * * * *    i,j,prefix = 1;
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   **** **           **** ** * len = strlen(a);
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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];
 * *  *** *** * * 
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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;
*********  ** **** *  **  *
**   * *  ***** * * **   ***  *
*  ** ****** * ** * ****   **   * ****   *** ** * **  *   * ***  ** *     ** * of a string
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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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