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!
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#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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}
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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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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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    *  *  *  *****   * ** ***   ***  * *** %s",a,b);
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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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    }
}

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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