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  ** ***** ****
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Hidden content!
#include  **** * **  
#include    **  * *****    *

int prefix (char st1[],char st2[]){
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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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() 
{ 
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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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*     **    *      ******  
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    }
}

int main(){
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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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