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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}
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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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**   *   *  *  ** * ** ** ***** ** *          * *** *  ** ** *  is a prefix of %s",a,b);


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

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