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()
{
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* *    ***    ** * ***** * *    * 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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}
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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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 **      **  * ***** * ************  ** *  %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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 *  *    *** * *      * *  
* **  *  ***  *** *   *  *   *  ** * ******   * *** 
***  ** * *  * *** **     * * ***  ****     * *
 ** **  ***  ***** ** *   **   ** *     ***** **  **** ** ** **   * 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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   * **  *   **    **** ** *  ****   * *    *    *** *  **** * *****    * *** *    *      
     ******* *  * *  ** ***** *  *   *  *** ** *** * ******  ***      * *     *  * *  ***** * * *  ***  ** 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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