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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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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*   ***  ** *  *  *     **  ****  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)
{

*****   * **  ***    *  ********   ****** ** *
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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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*    * ** ***  * ***    
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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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