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

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

int main() 
{ 
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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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** **  **  ******* * **   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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