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!
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#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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  ***  ***     *       * *****   
}
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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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   **  * * * * ** ****   **    * ** ** %s",a,b);
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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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}

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