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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}
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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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    ****  *  ** ** **  *** *** 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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   *** ** ** * * *     * * **  * *   *  **   *******  * *    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()
{
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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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 **    ****   **  * * * * *  *** *  * *    **     * ******* * ** ** *  *   *** of a string
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 * **  * ***** ** **** *  ******   * ***   * *     * *  *   ***      *  *  *  * **     *  * * *   ***  ***    * * 0;
*** *    * * *    * **     **     ** ** * **** 
* *    *     *****   ***  *** *  **  ***   *** **      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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