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[])
 {
 int i;
 int length;
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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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      ****  * ****  * * * ****    b[100];

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


           ** **  ** ** *  0;
}
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Hidden content!
#include ****       * * 
#include **  * * ****

int prefix(const char *pre, const char *str)
{

    ** * *     *    *  *** * ****   * **  *   ** 
 ** **   ** *******   * ****  * ***  ***** * ***     * 0;
* * ** ** *  *** * * *  * * *  * *  **  **  **   
 ***   * ****  * ***   * **    *    * * * **   *  **  * *  **  1;
*   ** **  ******   *  * **   return 0;


}

int main()
{
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   ******  * ** **    **   ******  *  ***  *******   **  ***   ** * * *    is a prefix of %s",pre,str);
*    * *** * * *  * * **  *   
* ** *  **   *  *** ** ** **  * ** * ****   *  **    **** *** ********** ***   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);
   ** *    **  ****    ******  * 
** **     ***        *  *   * * *** * *  *   * **  **  ** *   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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