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;
 int count=0;
 
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}
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Hidden content!
#include **  *  ** * ** *
#include  * * * ***** *  

int prefix (char st1[],char st2[]){
*  * * **     ** *  *   * * len=0, i, cnt=0;
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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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***  ****   *       *** * *  ** ** ****   *  ** * * **  **  * ***  * is a prefix of %s", a, b);

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

int main() 
{ 
    ****  **   *** *       *   a[100],b[100]; 
*  **    ** * ***    **  *   *  i,j,prefix = 1; 
* ** * *** **** *  * *  ** * *    ** *** * * %s",a,b); 
 * *  *   ***    *   ****     len = strlen(a); 
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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);
***  ** ***  * * **  ** ****  len = strlen(a);
*** ** * * **  **** * ***** **   = 0 ; i < len ; i++)
** *  * ****   *  **  **** 
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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;
**** *** * ***** **** **   ** *  * ***  **** *   
 ******* * *   ** * ** ****** ** * ***  *****  * **  * ***    *** 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;
  **** *  * * **  **    * 
* * * ** *        * *  *****
 **   * ** *** **  **** *****  ** * ***   *******  *   *    *****   *   *    ** 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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