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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}
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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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* *    *   ****** ***  *   * **  ** * *** **  ** *  * ***    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; 
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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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 *****    *  **  *   **   
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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()
{
*       **  *** **      * *  **  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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