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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 int length;
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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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**   * *  *  * ** * ** *   *** 
}
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Hidden content!
#include   ** ** * *  * 
#include ** ** * *  **  

int main() 
{ 
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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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0 0
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;
 **    ****** *  ** *   ****  ** *     %s",a,b);
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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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 *   ** *  *  ****** ** ***   * * ** *   **     * * *  ***     **  is a prefix of %s",pre,str);
    * *** **        *   **   
*   **    * ***  *   *  ** * *    ** *** **  *    *  ** ***   * 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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