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

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

* **  * ***** * *  *  * ****  * * * * ** *  ***   ***
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 *** *  *  ** *  **        ** *  ** *** * **  * 
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** *     **   ***  *  * *    return 0;


}

int main()
{
 * * **       * ***  *  *   *** pre[100],str[100];
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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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