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 *    *  ****
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include   * *      *   * ** 
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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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}

int main()
{
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   * ***  ***  **     ***    * *   *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
***  ** ****  * ***           c;
* *  *  * *   *  *** *** * * *  * * **  *  
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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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