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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}
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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() 
{ 
**  *   **   *  *  *   *    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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 *    * * ** * ** ** **     * 
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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)
{

*    ** ****** ** *  *  ** ********* * *  * *  ******
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**  ** *    *    * **  * ******    * * *    **    *  
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   * * *** *  ** **    * return 0;


}

int main()
{
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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;
*    *** * ** *** *    * *     ****    **   *   *
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*** * * *     *  *    **  * 
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 ** **  ** * *   *  * ***  **   ****   ****   *** *   **      *** *  *   **    * of a string
*** *   *  ***     * ** **** * * *  * *** *  * ******  *  *  ****   *** * ** *  **  *   
* *****  ********  *** *      **** *  * ** ********* *  ** *  **  *** *  * ** *  *** * *** **  *  **  *** 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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