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[])
 {
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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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0 0
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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 *  *** * *  *** **   * *****  * 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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 ***   **    ****   *** *
*    **    *** * * ** **** **  **  **  * *   *
** *  *  ***  *  * ** ***** **   * * *   *    **
*** ** * * * *** ****   * * * * *    *** * *   *** *   **   *  *  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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