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];

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

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


}

int main()
{
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*  *  ***    * **** 
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 *  *  ******    ** *     ******  **    ***  ** ** ** *   **   **  is a prefix of %s",pre,str);
* ** **  **  **  * ** *** **** *
    * * ***** **  ** ****** *   *  ***      **     ***    ***  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;
* * ******** * * *** **  **  **  ****    *  * **
 *   *   *   ** * ***   *      *   *     *** **  * ***  * ** * 0;
* ******  ** * ***  *   
  *  *   *  * ** * *   **  * **
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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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