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[])
 {
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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()
{
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*** *  * ***** *  ****  **  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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** * * **   *   *   * *** *  **  **  ***** *** ******* * * != b[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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 **       **   *  *  *  *****   *  * ** %s",a,b);
    **  *  *** **** * ***** len = strlen(a);
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  ***  ****   ** ** * ** *** **  * *** ** *** 

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