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;
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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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**   ** ***  *      **  *  *   
}
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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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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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** * *  *  ***   **** *  * * ** *   *       %s",a,b);
  **  ***** *   *      *  ****  ** len = strlen(a);
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   * *** *      **  * * *   **  *****  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 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
** * ** ***  * *  * *   * *   **** * *  ***    ***  ** *  **            * ** * *  **  **      
   * * **   * *     * * *  *  ** ** **  ***   *   ** ****** *** * ** *** **   * * *  * ***  *  * *  *   **  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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