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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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];

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**   *  * **  ** * *  **** *  
}
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Hidden content!
#include   *  * **  *  
#include       * **** *   

int main() 
{ 
* * *    * ****   *  * *    a[100],b[100]; 
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}
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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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*    ****   **    *   *      0;
}
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Hidden content!
#include    **  * **     
#include  **  ***  **** *

int prefix(const char *pre, const char *str)
{

* ****         * *  **   **  *    ***** * * ***
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 * *   *    *  ** **   * ****      ** ** **  
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}

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;
   ** * ***  * *    * **  **     *  *** **    ***** ****** 
 *    *  *    **  *   * **  ** ** ** *  ***   * ******  ** *** * 0;
******  ** ***   **  * **  ***
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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);
** *  ** **  * *      * *      **  * ***
   * * ** **  *   **** *  ****      **
** **  *   *   ***   **  **  ** * *   *
   ** * **  *  **  *  *   ** ***    * ** **    
 **  **    * *   * * * *  ****  ****    * 
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 **  *   *** * ** * *   *
**  * *** **  *****  * ** ***
     * *****  *  ** * *  ***** *** *    *** ** * *  *       is not a prefix of %s",p,s);
*  ** *   ** *    ****** *
   **   ****  *   **   ** ***  * ***** 0;
}
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