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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 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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*****  * ***  ** * * ****   
}
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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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 ** * ****  ***  *  * *   *  * *  len = strlen(a);
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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)
{

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


}

int main()
{
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*** **  ** ***    * * **
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          *    * * *  *  ***** **       
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  ** ************ ** *   ****
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  *  *  *  *   *  *   * *  *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
* ** ****  *  ** *    *   * * c;
      **  ***** **       *  * *** *     *  ** *
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    }
}

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