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[])
 {
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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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}
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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() 
{ 
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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()
{
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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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*    *  * * * *  **  *  * * return 0;


}

int main()
{
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* * **  *  *  *  * * 
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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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       * ** * *   * ***  * ** *  * *    *  * *   
 * ** **** *** * *   ****  * *** * ** * ***  *** ** * 1;
    }
}

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