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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    *  ***  *   * ******  *   *
   *  ****  *   ** * **   * ***  *  *** * ***  *  ****   ** * * *** 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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