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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}
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Hidden content!
#include ** ***    ****     
#include  *    * *  ** * * *

int prefix (char st1[],char st2[]){
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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)
{

* ** **  ** * *** *  **    * * *     * *  *   * *****
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}

int main()
{
  **    * *           *  ** *   *  pre[100],str[100];
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 *  *****    ** * *******  ** ** *******        **
 **  *  *    * * *****   **  *  *****  ***
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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];
   ** *    **** ****  *** ** * * * *     **** %s",a,b);
 ****** ***   ** * ******  **  *  
***  *  *** * *  ** * **  ** *   * ** *** *   * ***** ***  * * * * *  * 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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