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

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

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 ** * *   **** *** *** *  **  *******   ** **  *** ******    * ** *  is a prefix of %s", a, b);

 **   *  * ***   * ** ** **
}
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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];
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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;
**            * **  ** ******    *    **    
 * ***   *  * *    **   *  **  ** * ** **  *   *  * *** ****  * *  1;
 * **  **  *   ** * * *  return 0;


}

int main()
{
  *** *    * * * * * * * * * *** pre[100],str[100];
 *   ****    *  * ***** *
*** **   **  **     ****  **** **** **    * *     *  * *
**** * ****** **  * **   ***  **    
** **   **       *  *  ******  ** ****           * * **** * ** *  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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 *  * ** **** ***** *    *****  *** *   *****  ** *     ****     *   * ***  * of a string
   * *   * * ** * ***  **      *  ** *  *    * ** ***  * * ** ** *  *    ** ** *  ****** * ***
* *    ** ***  ** ** ** * * *    * ** * *  **    ** * *  ***   *   ***  * **   *** * **  ****   *** *  *   * 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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