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

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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  ***** *** ** *  *  **  * **  
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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;
*** **  * **** ** * ***     ***** * 
  **  **     **   *  * *      *  * *  *  **
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 ******  *  * *  *        *  *  ******  
 *    * *** ** ** **  *    ** ***  *
** **  * ****   *      * ****** * * 
   *  *** ******   ****     *     ** **  **    *  
 ** *   ****   **** ****  **   ***  *  *  
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 *   *  * *** ***   * * * **
 *  *  * ** * *  * * ** *   
 **  ****   **   ***   **     ** *   ****   * * **** *   *    * is not a prefix of %s",p,s);
     *   * *  * **  *     * ** 
 **  **  ****  ****** ***  * *   0;
}
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