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

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

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

int main() 
{ 
   ***  * *** *** **  * ** *  a[100],b[100]; 
* * ***    *****   ** *** * * i,j,prefix = 1; 
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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];
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 ** * ****   **  ** *  *  ******    *  *  %s",a,b);
*****   *   **  * * * * ****     len = strlen(a);
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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()
{
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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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***** ****   ** *   * * *    *   * * *  **   ** ** *  * **     *  ***     **  * * **   **
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    * * *  *******   * *   ***** *   * * * ** * ***
 **    **    * ** ** ** ** **   * **  **** * * * **  *****  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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