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[])
 {
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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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     * *      *  **** ** * * *   *  *    *  *  ****      *  * 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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