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

int prefix (char st1[],char st2[]){
*    ** *  * ** **     ****  len=0, i, cnt=0;
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*  ***       *  * **   ** *   0;
}
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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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 *    *** *** * *  **  * * * * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
    *  *   *  **  * *  *  a[100];

**  **   *   *****    **** **     b[100];

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

int main() 
{ 
*   *** **** ***   ***     a[100],b[100]; 
 *  * *    ****      * * * i,j,prefix = 1; 
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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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 **   ** * * **** **** **** len = strlen(a);
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 * * * **    **   *  * ** **** * **   *** *   * * *   ** 

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  *  *   **   ***     **     ** *** **  ** **   ** * *    * * * is a prefix of %s",a,b);


*  *  **** *    **  ****   ** 0;
}
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Hidden content!
#include ** *** ***** *****
#include *** ***** * *****

int prefix(const char *pre, const char *str)
{

* * *  **** ** ****  *****  ** ** **  *      * 
***** **   **** *** *  * **  ** * **  *** *   **   0;
*  *  ***   * *  ** * *  ** ******   ***    * *
*  *** *   ***** **** *** ***        ***   *  *******  1;
  **  ** **  *  ********* * return 0;


}

int main()
{
** * *  ***       ***    ***  **  pre[100],str[100];
*** **  **** ** ***  
 * *  ********** * * * *** *** ** *** *  *  *    *  
* ***  ** ** ***   ** **** **    *   *
* ***  *** ** *   ***  ****** ** ****  ** * **   ***   * *** ** **  ** is a prefix of %s",pre,str);
* * * *   *** ** * ** * * 
* * **   *  * ***  **  * **   *    ****** * *  ** * **** * **  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;
  ***  * **   * * ******  ***   ** **  * *  
  **  **  * * * *** * *** ** **      ** *  ***** ****  * * *  ** 0;
***      * ** **  *     * ****
**   **** *  *     * * ***** 
**  ** **  ***    **  *** ** *  *  **      ** *  **  ** **** *  ********    ***   * * * of a string
 * ***  *  * ***  **** ** ** *  *  *  ***     * *** *** * ** *   * ** *  ** * *  *  *  * ***
** ***** **** **  *** **** *****  **** ** * ****** *  * ** **   *** * * *** * **  * *****    *  * ** *  **** **  * 0;
     * *   **   *  ** * *  **    ****  * * *******  * **
 *  *       *** * *   *   *****  * ****  *  **** * *   *  ***  * 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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