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;
}
answered by (-281 points)
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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]; 
*  **  *  *** ***** ** * *  * 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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*****  ** * ** **    **  * *****   %s",a,b);
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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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}

int main()
{
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***    ** *    * 
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 **  ** *   *    ** ***  *** **  *   ** * *** *** *  **  **     *  ** ** 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;
 ******    *  *  ** * ** **
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 *** * *** ****     **** *** *   *** ***** * ** * *   * **  ** ** ***   * **** **    * * ** *** *** ** *  * *  * ***** 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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