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!
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char prefix(char s1[], char s2[])
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Hidden content!
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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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**   ** * ** *  ******   ** ******  * * ** * * ** **
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}

int main()
{
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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;
  *** **  **  * ** * ****   ***  **    ***  ***  
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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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