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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*  ** ***  *  *** **  **   
}
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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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0 0
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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****** ***   ***   ***     ** * return 0;


}

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;
 *   ****  * **   *** *******   *****  * *** ****  *
* **  **     *** *** ** *   * *  * ** ****  **    ***    * 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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