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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*   ********     *      ******* 0;
}
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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];
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 ***   ** * * * * ***   **  ******* *  ** %s",a,b);
**  *  *   *** * *  *   *  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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*   *    *** ***    ***  *  *  *  
*  *   ***  *  *** * * * * * ***    *   **   ** ***     ******* *  **  *   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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   *  *  ** *    * *    ****     *    **  *    **   * * * * ** ** * ****      * * * * 
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  ****** ** ****** *     * *   *** ** ***    * * 
 *    *   ***** * *  * *  * ** ** *  *  ****     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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