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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*   *    * ***       ****  *** 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()
{
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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)
{

  * ***  *   ******* ***** ***   ***   *      **   
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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;
 ** ***       *  ****  * * * *  *  **   *   *   
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 ***   *  * *           ** *
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  ** * **  * ***  * * *  **  **** ***  ******   ** * *****  ****     ** ** ***    *  * *     ***  * 0;
*   *  ** ***** ***       *  * **     **   * **     *** 
  *  **** * * * * * ***  ** *****      **  *** ***   ***** 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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