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; 
   * ********* *** **   ** * *****  %s",a,b); 
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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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 **** ***   ** *   * * * * *  * **    %s",a,b);
 * *  * *   * ***** *** *  len = strlen(a);
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**  *  ** **    ***    *  *    ** * ***     *  
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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)
{

      * *  ** **  **** * *    **     *  ***      * * *  * 
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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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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
 ****      * * * *  *  *** c;
 *** ******  ** ** * **  * **   * *** *  *  **** 
* *  * * *  ****  * * ** ***   ***  *   *  *   *        0;
 *    **   **  *** **   **  * 
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**  *  *   * ***  *  **  * ***  **   *** ** **** ****  **   ***  ** ******* ** * *  *
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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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