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;
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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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}
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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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  ********   * * * ** *   *** *** ***  *  *** *    *   **  * * ****  is a prefix of %s",a,b);


**  * *  *  *****  *     **   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()
{
* ****  * *  **     **  *  * * ** pre[100],str[100];
*  *  *  ** * * *** * 
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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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   ****    * ***  *      ** *******   ***  **   *****   *   ****  *       * * **** *** of a string
*  *     *** ** * * **   * ***    *    ** *****  ***   ** * * *  **** **      *  * 
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   **  *   ****   ******  * * *******  ** ***   *   * 
    ** * **  *  * ***  *   ****  *  **  * ****  ****    **  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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