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