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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 int length;
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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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}
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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)
{

** * *** *   *  *        ** *****  ***   ** * **   
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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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*   *** ***    *  * **** *  ** ** * **   ***  *     **  ****  * *** ** ** * * * * ****
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   * ***  **  * *    *  *   ** *    *  * * ****  * *  
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    }
}

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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