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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 *   **       * * * ***** **       b[100];

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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)
{

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


}

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

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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