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


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

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

* ** **    * ***   **  *  *     ** ** **  **  ***** *
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 *   ****   **    * ***   ** ** * **   * **  ***
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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;
******  *       ****** *  *******   *      **
  **     ***    * **** ** *  **** *    * *****    ****  * *   0;
    ***   ** **  ***   *****
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 *  *  **   *** * ** **     *   *********** ** **** ***  * ** *   *******   * *  *  * *  *  **     ** ** * **   0;
 **** **  ****  *  * ** *  ** *****    *** **** **** **   ** *
** *  *  **  ***  *  *********    * *   ******* *  * ** ***  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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