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;
 int count=0;
 
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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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 * *  **  * * *  * *    * * len = strlen(a);
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 * *  **   * *    ** *     **** ******* *********    ****  * **     * ********    **  ***  *  is not a prefix of %s",a,b);
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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)
{

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


}

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;
   *  * * *     *  ********  * * **  * **   **
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** * **** **   *  * **    
 ***** * **    * * * * * *******
  **   *        **       ***   ***     ***   ** **    ** ** ***    * *** *  *    *   of a string
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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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