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()
{
* *      *    * *  *  * * **  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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* *  **  **    * * *  * **   * * *** 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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****   **     *** *    *  *  * * *   **** *** * 
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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;
 *  *  ***      *****    * 
* ** *  *** * ** *** **   **  
 * * * *    *  *    ***  ** ** ***     *  *   **   ****** *   *   * *    ** of a string
 *     * *  * *  *   * * ** **** *    ** * ***    **  *    ** ** *  **     ***  * *   ***
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***   * *** *   * ****** ** * ** *** *******  ***  **  *
*  ***  ***      **** ** ** ***** ** *   *** ***   * * *  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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