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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}
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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()
{
      *  **    *   *** *    a[100];

 **  ** *** **      * * ***  ** b[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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}

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