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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}
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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() 
{ 
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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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** *   * **      *     * ***   *
*  * ***  * * **   *    *  ** *    ***   ** *  *   *** **** *   *** 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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