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()
{
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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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    **  *  * ** ** * *   * **  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()
{
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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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*    * **** ***  * ***     ** *  * *    *   ***** ** * ** 
  ***    **  *   *      *   ** ***** * * *** ***  * * * * 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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