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[]){
*** ** ** *     *  ** **    len=0, i, cnt=0;
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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];

***   ****  ***  **     *     **  *  b[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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0 0
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];
 ** * * ** ** * * *   ** i,j,prefix = 1;
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      **  **    * * * * **  * 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()
{
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 ** *  **   **    * *  ***
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   * *** ** *  * *** ************* 
 *  *  *** * *   **   *    ** *    *  ** **  *** *   **   *** ***   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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