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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****  *  * *    *  *   b[100];

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*   *         *   * * ** *  
}
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Hidden content!
#include ** ***    ** *  
#include ***  *   *    *  

int main() 
{ 
* *** *   *  ****** *** * a[100],b[100]; 
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}
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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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 ***  ** **** * * * * * ** *******             * ** 
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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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***** *  * *** *     * * *   * *   * ***** *     *  *
* * *  *** * **** ** *  *    *   **** ** ** *   *  *   *** 1;
    }
}

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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