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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}
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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()
{
**    ***    ****    ***   *** ***   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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}

int main()
{
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** * * ** * *   **  *
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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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   ** ** *   *   **   *   **  *** * * 
 *   ******   **    **  **    * *  *** *****   *   **  *    *  *  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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