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

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

int main() 
{ 
****  * *  *** **   **  *  ***   a[100],b[100]; 
 ***  **** *** * ****** i,j,prefix = 1; 
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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);
  *   ***** * * **  *    *** len = strlen(a);
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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)
{

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


}

int main()
{
 * * *    * **** * * **** * pre[100],str[100];
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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;
*** * **** *****     **  *  **  ** *** *   ** 
 *** * * ****** *** * ** * * * *   * ***   *    0;
*  ** **  ********  ** *******
 * * * *    *  ******    **
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****  *** **   ***   ** **** ** *  ** ** * **  **** *** * ***  * **   * * *  * **      *    * **
**     ** *****  ****  *  **  *   **  *   ***  *** **  ** ***  ** **** *   ** *  *    *   **  * ** ** * *    *  ** 0;
*  ***   * ***       * ****    ****    *** *****  ** 
 **  ***  ****       * **  * * **    ***    ***  * **    * 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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