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[])
 {
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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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}
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Hidden content!
#include  *** **   *  
#include * ***   * * *  ***  

int main() 
{ 
 **  * ** *     *   *  * * a[100],b[100]; 
**  *    ***   *** ***   *** * i,j,prefix = 1; 
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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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    **** *** ** ***   **   * * **** *  **  * **  ** * 
   **  *** ** *****  *     *    **  *   *** **** * ***** 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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