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[]){
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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];

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***    **** *  ***  **  **** 
}
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Hidden content!
#include **** *  * ***** 
#include  ** *  * ** *   

int main() 
{ 
  ***  * * *  ** *  * **  a[100],b[100]; 
* **     *    *  *** ** ****** i,j,prefix = 1; 
  * *   *    * ***  * ****  *****   ** %s",a,b); 
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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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  ** *   **    *  *** *  ** * *  ** 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];
 ***    ***** * * *  *
* ******* ** ***  *  **   **  * *  **** * *
***** *  **     *   *   ***      **   ***
 **  ** ** ****  * * *** **    **** * *** ***  **  **  *  * *  *  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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*** **   ***     * *** ***** *   ***  **** *****   *   ***  * ***      *** *   *      **** * *   *
   *  *  *  * *  *   * ***** *    **  **** * *  * *  *** *  **     ** * * *   *  * * *** *   *** *      *** 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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