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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}
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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() 
{ 
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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()
{
  ** *    **  *** *   * *    *  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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  * *** **  *  * ** ***  * ** *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
**** ** *   * * *  *     *  c;
*    *  *** * *** *   *  *  *  ** *  *** ***  **   *   **
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    }
}

int main(){
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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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