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;
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Hidden content!
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#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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}

int main()
{
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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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 *   *  **  *     ** * ***  * **** * * 
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 ** *  *** ***  *   *  * ***   * 
 ******   * ** *  **** *  * ***  **  * * * *   * *  * *       * ***  * 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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