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;
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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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*   *** *** ** ***** * ***   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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    }
}

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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