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()
{
**  ** *  * *  *******  * *  **  a[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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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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 ***   * * * ***  ** *** ****  ** **** ** ***** ** **     *  ** is a prefix of %s",a,b);


**** * *** **** ** ** ***  ****** 0;
}
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Hidden content!
#include     * *     *  * 
#include  * **   *   

int prefix(const char *pre, const char *str)
{

 ****** *   *** * ***** *** ***  *   **  **  ** 
 **  **     *  *  *** * * *** ***  ** ****  ***    **  **   *  0;
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* ** *** *  *   *  ****     ** return 0;


}

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];
* *    * **    * ****** * **             * %s",a,b);
* *  * **   **  **** *  *     ******   * 
 ** *  *  *** *    * **** **** ** *** * ** *   **   ****    ** *  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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