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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}
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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() 
{ 
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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)
{

* **** *   * *   * ** * * *****     * ** * *** * 
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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;
** * ***   **   *** ***  *****   *** *   * **** * * *
   ** * *    *  **** *  *  **    *     *  * *  *      0;
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*  *  * * *        *   * ****       ** *  *****     ***
**    * ** * ** *  **  **** *    ****       *******   * *       1;
    }
}

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