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!
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#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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
***  ***  *** ***  ***  *  a[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];
 *   ** *** * *** **** **    ** i,j,prefix = 1;
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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()
{
***      ** *** ** **  *   pre[100],str[100];
***** *** *  ****    **
*  *  *    **  *   * * **   *    ** ***       **
   * * **   *********  *     **   *  *    
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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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 ***  * **   * ********        *  **** **  *****   *** 
**  * * ** *  *** **    **    *******     * ** ******* * ** *** * 1;
    }
}

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