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[]){
* ** ****  *  *        *** *   ** len=0, i, cnt=0;
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*****    *  *  * *  *** *  * *  * 0;
}
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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()
{
*    **  ******** ****    *** *  a[100];

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

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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    }
}

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