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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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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**  ** * **  **   * *      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];
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 * *  *** * * ****    ***** * **  0;
}
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Hidden content!
#include  ** * **   * * * 
#include   ******** *  

int prefix(const char *pre, const char *str)
{

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

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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