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!
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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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}
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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)
{

*   * **** *** * *   * * ** ** *      **      **
     **  ***  * * * **** *  *  ** **  * * **** ** **   **  0;
 **** *  *  *** *   ******      *  ** ******* *   **
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}

int main()
{
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 *   *    *  ** *  
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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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  * *** ******      ** **** * ***** **        ** *  *
 * ******   ******* **   ** ** ****** **  **   **   * ***** ****  1;
    }
}

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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