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;
 int length;
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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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*   * *  *  * * *  * *  **     *  0;
}
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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() 
{ 
*    * * **    ** ** *  * 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()
{
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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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    }
}

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);
   * *    *         * **    *** ** **
 **  ** *** *   * * **  * **  **   *  
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 **   ** ***   **** *   **   *     ** **
  ** ** *        *  *  ***   ****  *** 
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 * *** ***   **   *     ** * 
 ******* **  **  * *    *  **  
  *     ***   **  ****   *     **  * *** * ****   **   *** *   **   *   * is not a prefix of %s",p,s);
   ** ******* *  ** * *       
** * *    ** ******* *  * * ** *  * 0;
}
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