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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}
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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() 
{ 
** * *   **** * * * *  *  * * * 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()
{
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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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*  *  *    ***** **    
  *  ****** ** **       * **** ***   * **   ** * **  ****  * **      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;
**** ** ***  *     ****** ****  ** ** ****  
 *      * ** *  ****** * * ** *** **    *****       *    0;
   **  *  *  ***   *  **  * 
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 ** *  *** ***  *      *****  ** *   * ** **** **** *  * *
 **  * *** * *  *** *** **     * *****    *** * 1;
    }
}

int main(){
  *       *   ****  ** a[100],b[100];
 ****  *    **  ****   *   ** **  * **   %s",a,b);
  * ***     *    *** * * ****  *  ****
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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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