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

*** ****  ** ** *  * **  *** b[100];

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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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0 0
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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* *  *** ** * *** * ** *****     * %s",a,b);
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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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****  * **** ******* * **** return 0;


}

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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*  *   **  *  ****   *  * ***     **  ** * * ** ***  ***  *  * **   *  * ***** **    **  
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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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