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()
{
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* *   ** **    ***  *   **   *   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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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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   ****  *  *  * *** ** *** ** 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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 *  **    ** ******  *    * * ** * return 0;


}

int main()
{
* * *********  * **  pre[100],str[100];
 ***  *** ** *** **  *****  
  *    *  *   **  ***  *  *  *   * **   **   ****  * *****   
 ** * *   *  **      *** * * ******
  ***  *   **    ** *** *   **  * ** *  * *     ** *        *    ** * is a prefix of %s",pre,str);
   ** ** **   *  **    * * *   * 
     * * **  *   ** *     **     ** * **  *   * *** *  ***  *  **  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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