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  *  * ** * 
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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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}
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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]; 
* *  ***  ** **  *****  *      i,j,prefix = 1; 
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***    *   **  ** *   * len = strlen(a); 
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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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*  * ** *******  * **  *   *  0;
}
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Hidden content!
#include **  *     **
#include  **   * **    **

int prefix(const char *pre, const char *str)
{

******* ****       * ** * ** ** **   ****  ** *  *
  **  *  *  * *** ***  **** **  ** ***  **  *        * * 0;
* ****** * **       ** ***** **  *****  * *** * *  *  
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}

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