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];

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

int main() 
{ 
*     *    *** **  ******** a[100],b[100]; 
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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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** *   *** *       *   * * * *   *  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 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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** *  **  ** *  ****   ** *****  ** *  **** ** **
*   * *   *   **** *   *  ** *  *  *** ***  *  1;
    }
}

int main(){
 **  ** *  **  * * *  ** * ***  a[100],b[100];
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 **   *  **  *   * * *   *  ***     ** * 
 *******     *     ** **  * *  * *** *** * ** *  ** * **  * *  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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