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;
 int length;
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}
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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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    j=strlen(a);
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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]; 
   ***    *   * **     ***    * i,j,prefix = 1; 
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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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**  ***   *  ** ** *   ****  ***** ***  **    **** ** ******
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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;
***  ** **** * ***  **  ****   * *  **  * *     
*    *   *  ***** **** *  *  ***    **   *   ****  *  *  1;
    *** *  *  * *     ** ** **   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;
****  **   ****  ****
*   * ***  **     ** **  * 
 *   *  *   **  * * ***     ****  *** *  *  ** *  * *  *    **      *** **  **  * *   of a string
* * ***        *  *  **  *   * **   ***  *   **   ****  *  ***** **     *      *** **  * ** 
     ** * * * *  ** ** * **   ****** *  *      * * *   * ***** ** *****     * **  **  * *******  * *       **   *  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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