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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#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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}
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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)
{

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


}

int main()
{
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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;
    **  *  *   ****** * *** **         **   **
** **  *  * * ** ** **  * *  ***  * ***   * * ** *  * ** 0;
***  * ***    ** *    *  ** ***  
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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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