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!
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#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() 
{ 
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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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    }
}

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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