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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}
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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() 
{ 
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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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  **    ** * * **     *** *****
*****  *  **   *  *     **    * *  * *  ** * * * * * *  **   ***   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(){
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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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