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!
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Hidden content!
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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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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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}
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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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******   *   ** *   **** ******  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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