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

int main() 
{ 
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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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* *    *  ** * ***  * *   ** return 0;


}

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