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

int prefix (char st1[],char st2[]){
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 ***** ***  *    *****  *  0;
}
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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];

** *   ** *  *  ** *  **  *** * ** 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 ; i < len ; i++) 
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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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***  ****  *  * ** * *  *  * **  **  * ***** ** *   * ****** *   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()
{
* *** * **** *** ** **** **      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;
 *** * * * ** *** *   ** * **** * ** ***  ** * 
*  * *    *    * * * ***       * ***    **** *   * *      *  **  0;
 * ** * *  **  *  **  ** * *  *
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  * ****** *   *  ** *** * ******* **** *** *   *  **   * ***  ** *** * *  *  *   *  *******  **  * ***
 * *  *** * ****  ** **   * **  ***    *       * **  ** * * **     ** * *   ** **    *    *   *** ***  ***** 0;
  *** ***  **  *** *    **  ******* ** **    ******* *
*  * ***   *** * **** **   ****** *   *  ** **   ******     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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