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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Hidden content!
#include  *    ***     * *
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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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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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}
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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()
{
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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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