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!
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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()
{
**  * **** *    *  ***  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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* ******  * * ** * ** *  *** ** ** * *  *  ***** *  
* ***** ** ***** * *****    ** * ******  ** ** *  ***       *  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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