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)
{

* *     * ***  ***  *  ***  * ***  **   ***   *  *** ** * * *
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 * * **  ** ** **  **      *     *   * *   ** *  *  *
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}

int main()
{
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** * ** ** *         **
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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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   *   ***  *  *  ** *  * **** ** * * *   *   * ****  *
* ****   * **** ** *** ** * ****** *   *  * ****** * **   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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