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;
 int length;
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}
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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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** **  **** *  ***  *  * * *  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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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)
{

* ** ****** * * *  ** **************   * *  *    *   * 
      * * * **     *  * ** *       *  *     * *    * *   **  ** 0;
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}

int main()
{
*  **  *****   ** *  * pre[100],str[100];
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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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* *    ** *  **   *  **    ********** *  *   *  * *  
**  **       ** *  *** *   **  *    ***  ***** ** **  * 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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