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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}
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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]; 
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**   *    ***   ** **  *  ** *  ** * **     %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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 * * *      * *   ***** * *
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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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}

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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 ****  **     *    *** ** * **  *   * *** * ***** * **     
   *     * *    * *  * **  * ***   ***  **    *     * * 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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