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;
 int length;
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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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   *   *********  *  ** * ****  *     *  ***** *  * ***   
* ***  * * ***        * *** ******  * *    *   ** ***  *******  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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