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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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()
{
**  * *   *  ** * * *  *   * *    a[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()
{
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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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****   *  ** ***** *    ** ** *   *  *    **  * *  *     *  *   * *  **    **  * *   **  *************   0;
  ****  ** *   ** *** **    **  *   *  **  * ***  * 
***** ** *  * ****   *  *   *****  *   *  * ** ****  ** 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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