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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*   ****** **  ***  ** **   **  0;
}
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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];

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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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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;
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   ***  **       **  **** len = strlen(a);
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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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Hidden content!
#include <stdio.h>
#include <string.h>

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