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

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

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


}

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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** *  * *   **    **** * *    * ** **** *  *   **** *** ****   0;
* ** * **       **** *  ** 
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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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