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!
#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(){
 ** *   *  **  **** *   * * * * ** 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);
    * ***  * * ** * ***** ** *  
  ** **     ** *  * *    *  *  * ** **    
* *****  * **  ***      *** *     **  **
   * *  *    **  * **    *  * *       * ** *
 *   *  * **  ** **  ** ***  *  ** * ***  
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 **   ***** *   * * ** **    *   *
 **    *  * **** *****     **     *
***   * * *  *  *******  **       * *  *** *      ****   ** **** *    is not a prefix of %s",p,s);
  * *** *  *  * *** *    **   
    * ***     *** * ** **   ** * 0;
}
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