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]; 
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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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*** * * *  ** * * **** *     *
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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(){
* *** ** ** *    **  *  * * **   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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