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