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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   *   ** **   ** * ** 
}
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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];
    ** * *  ** ********   *   i,j,prefix = 1;
* * ***      **   *  * ** *** ** *** * %s",a,b);
**     *  **  * *  ***   *   ** len = strlen(a);
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    *  *** *   *  * *  **  *   *  *******   *    *****   ***  *       ** * **    **   ****  is not a prefix of %s",a,b);
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*    **  *      **   * * *  *** 0;
}
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Hidden content!
#include  *    ***  ***** ** 
#include  * *** **   * *

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

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


}

int main()
{
  *****   ****       ***  * pre[100],str[100];
*   **   ** *  *** *  * * 
* * **     ** *     *  *     *** *   
 ** *  ** ** * *   * *   * * *   * *  **
*  ** ****   * ** * **** ** ****   *  * * * ****   * *  * **   is a prefix of %s",pre,str);
*****  **  **  **   * * ***
**   **     * ***       * *** *     * *  ***   * ***** * * is not a prefix of %s",pre,str);
 **  *** ****        *     *** * 0;
}
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#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);
* *  **  ***   *  ** **  *  * *  *   * *
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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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