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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}
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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() 
{ 
   * *  * *  *** **  *** ** ** 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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***** *  * * *   **    ** *   len = strlen(a);
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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)
{

* *   *    *    * *  **  * *****  ** *   ** **   
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  ***  *     *  ***   *  ****   *  * ***  ****    *
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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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**   ** **** *** ***          ** *** * ******  **   **** * * **** * *** ** * *    **
**** *  **    * * *** **     ** * ** **     *   ***** *** **  * * ** ***   ** *  ** **    ** *   *  * *** **  ***  * 0;
*  * ***  *****  **  ** **  *  * ** ****    *   **
*    ** *  *    * ** **     **  *   * *        * **  * ***  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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