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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* ***     ****  **  *  *** 0;
}
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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]; 
        *** *       **  *** i,j,prefix = 1; 
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   **** **   *  * ***** * * *  len = strlen(a); 
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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];
*  *   ***   *   ** *    i,j,prefix = 1;
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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()
{
    ** * **** * ** * *** **   pre[100],str[100];
 * *     *  ******** *** 
**** ** ***  * * *  *  *   * *     *** * * * *  *
   * * *   *  ** * ** ** *  ****   * *
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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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  *   *** ******     *  ***** * ***  *** * **  ***   ** *  * *** **  *  **  * *  **    *   
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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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