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!
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#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()
{
***  *  **  **  ***** ***   **   a[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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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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  ** *** *  *** **   *  ***  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)
{

  **     * ** **  *  *  *** *   * *   **  **
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*  *  ** * *  * *  **** * **** return 0;


}

int main()
{
*         *   ** * ** ***   **     pre[100],str[100];
 ** **     **     * * 
*  **   ***   *  **   *** ** ***        *    * ***
   ***      * *    **  * *****    ** * 
**  *** ** *****  * *  *   **   * ****  ******** *   *****  *** 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;
*** *  * * * * **     * *     **  **  **     **
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***   *  *  *** ** *   * ** *
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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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