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!
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#include *** **** ***     

char prefix(char s1[], char s2[])
 {
 int i;
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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()
{
*  * ****  *     * *** **** a[100];

 **  **    *  ** *** ** *** 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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0 0
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()
{
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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;
     * **  *   *  ***   * * * **  *  ** *** * 
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*    *    *  **** * ***    * 
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 ****   *    *  ** ****   * **** *  ****  *   ***  ****
   * *  *   * **    *  **** *  * *** *   * *  ***** 1;
    }
}

int main(){
 *** * * **** * *         ** ****  a[100],b[100];
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**  *   * ****  * * *  *     ** *   *  *
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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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