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[])
 {
 int i;
 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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***** **    ** *   **        * b[100];

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

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

****** ** *   * ***      ** * **** ****   * *****
**  **  *  **  *** **** ** *  ** **  *     * * * ***  0;
* ******   ******   * * *      **** *  ** * ** 
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}

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;
   ***** * **   **  ** * *** ** **
   * *  *  * *  *  **  *      ** 
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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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