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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*    ** *  **** ***** * * *   ** * b[100];

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  * *   * *  *   *** *
}
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Hidden content!
#include   ***** * * ** 
#include  ***   *** *** * 

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

**    * *  ****  *      *****   ** *   ** **** 
 * * ** ***  * ** **    ***  ***  **   ** ** * **** * **  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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* ** *  ********   **  ***    **     *    ******  * * **    ***   * * *   * *       *** ***** 
*   ** ** **  **   ** **** * *      *   ** *  **** ** * * ** * * *  ****     ******   *  ***** ***  ** * * **   * ***  *  * 0;
** **  ***  ******  **    ** **  *  **  ** **** 
  * ** ***   **  * *           *   **  **    ***** * *    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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