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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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()
{
** *  *     *  ***** **  *    a[100];

*  **  * *   **    ** * *   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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0 0
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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 *  ****** *    *** *  *    ***  *****  * *  * ***     **    * * is a prefix of %s",a,b);


     *  ***  ** ****   **  **** 0;
}
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Hidden content!
#include  * *  ** * **** ***
#include  ******** ***    *

int prefix(const char *pre, const char *str)
{

*  ** *** ***  ** ****** *  **** *  *****    **   
    * * **   * * *** *  *** *** *** **  ****  **     * * **  **   0;
  * *   *     **** * **  **   *  *   ** * * ***
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** ***   ***     *  **  **    * **    return 0;


}

int main()
{
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 *   ** * * *** ***** * 
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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;
 ***** * ** ***     ***  **   *** ****** * ** 
   *   **  *   **      *  * ** * ******  ******    0;
*  ***** * ** * ** **
* ** * ** * *    * ** ***   *  
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 *    ***  *  * *      * *   * *   ****   *     ** * *  * 
   *** ** ** ** *** ********** ** *  ****    * * ** 1;
    }
}

int main(){
 *  *   * *   **  * *   * *   * a[100],b[100];
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** * *   ***** **  *  * **** *  * * **
  ** *     *      **  ********* *     **  ** *  * ******* ** ** is a prefix of %s",a,b);
*    *   * ***** *   * ***      
    **    *   * **  *  *** ** ******** * **  **  ** *  *  *  *  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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