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[])
 {
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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() 
{ 
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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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  *   ***  *****  * **  * *
  ** **** **  ** * ****   * * * ** * * * ***   **   **     **** *** *** 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);
**    *        * * ** *     * * *  *  *  
 * *     * *  *   **    *  *  ***    **   
**** *      ***** **  ****   ** * * * ** 
*   *   *   ****  *    **  *  ****  * ***  * 
 *** ** ** ** *  ***  *   ***    *  *
 * **** ** * *****  *      ** * *** *  *       *  ** *   **   is a prefix of %s",p,s);
***     *****  *    *    * *  *
** * *** ****   *  * ***** *  **  
*  *** **   *****   *   * * ****** ** *     * *    ****  ** *  *   * is not a prefix of %s",p,s);
   *  * * *  **  * *     
 *     **** *   * **   *       * 0;
}
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