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 *   **  * ***  
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char prefix(char s1[], char s2[])
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}
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Hidden content!
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#include   **  *    * 

int prefix (char st1[],char st2[]){
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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()
{
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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()
{
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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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 *** *    **       ** ***    ****  * **  *** * *  ** * * ** ** **   ***  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;
 **  *    * **     * *     ** * **  *    **
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*   *  ***  *    *  *****   *  * *  *  **      * **    * 
 ***  ** ** *** * * *** ** ** ***        *  * ***** ***  1;
    }
}

int main(){
       * ** ****    *    ***  a[100],b[100];
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  **  ** * * * *   **  **      ** **
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 ** *  **** ** *  *** ** *  
** * **  ***   **   *    *  ******  * * ***    ***** ****  *  * * 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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