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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}
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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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}
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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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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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 *   *   *** *      *    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)
{

**********  ** **   *** *** *  *** * * ** *   *       *  
*  ***  * * ****     **  **** ** ***  **  * * *         * *   * 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;
 *** * * **  ****  *  
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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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