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


}

int main()
{
 ** *    *  * ***  ** pre[100],str[100];
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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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    }
}

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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