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

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

* ***  *     **  * * *** ** * * *  ***** *    *** 
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 ***** **  ****** *  *       * * *    *  ****   
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}

int main()
{
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* ***** **     *** ***    *    
* ** * ***   ****      ***    ***  **** * * *** *  ***** 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;
*** *   *** *  *  ** **    * *****  * * **** 
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  *  **  *       **   * *   *  ** *  *   *  *   **  * ** *  *    ** ***  **  * * **** ***  * ***            * 0;
*** * **** *  *    *** **  * ***  *   *  *   ***   
  ** *  * **** ** ** **** * *   * ***  **   **  **  * **  1;
    }
}

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