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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}
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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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 ****** ***       *  * ****** * *  * *   *   *  * * *** * 1;
    }
}

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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