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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**** * * ***  *  ** * *     **  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()
{
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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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 **      ****  **  * * ** **   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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 ***    ***  *** *** ***  *
*     ** ******* * ** * ****** *     ***  **  **   *****    **   **    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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