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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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()
{
***  ** *  *** * * *    a[100];

***** *  *  ** *******   **   * b[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)
{

  **   * *****   *  *  ****** ***  *    ***    *    
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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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*  * * * **    **   ******   *  ********** *** *    ********      * *  *  **    *      *
 **** * **   ***** ** **  * *****  ** * ** *** * ** *** *  ** ***  *    ** ***  *   ***     *****   *** **  0;
     * **   * * * ** *   * *** *** *  * *****   *    
  *    *   *  ** ** * *  *** **     * * *   *** **   ******* ** 1;
    }
}

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