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

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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*     ** ****   * ****   * ** *****  * **
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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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