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[])
 {
 int i;
 int length;
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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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* * * ** * *** *  * * * ***   b[100];

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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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0 0
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)
{

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